*Biogenics are not included in the trends

Updated Mar 27, 2018Updates since December 19, 2016

Notable changes from 2014v1 to 2014v21. Fuel Comb Industrial - new state estimates, limited changes in ICI methodology and updated activity data resulted in changes to PM10, PM2.5, SO2 & VOC2. Fuel Comb Other - Limited changes to Residential Wood Combustion resulted in changes to CO, PM10, PM2.5, SO2 & VOC3. Petroleum & Related Industries - new estimates from some states and limited changes to Oil & Gas tool resulted in changes to CO, NOx and VOC

4. Highway Vehicles - New inputs (representative counties, new fleet ages, proportions of alternate fuel vehicles, new VPOP) resulted in significant changes to CO, NOx and VOC5. Off-Highway - New rail computed, CMV port limited to water and several states updated activity data resulted in noticeable changes in CO, NOx and VOC

For more detailed documentation on the 2014v2 NEI please refer to the Technical Support Document (TSD) located at: https://www.epa.gov/air-emissions-inventories/2014-national-emissions-inventory-nei-technical-support-document-tsd

Updates since February 27, 2014:

Updates since February 17, 2014:Wildfires for 2002v3 were updated to accurately reflect the inventory published on http://www.epa.gov/ttn/chief/net/2002inventory.html#inventorydata2003 and 2004 Miscellaneous has been recalculated to reflect the adjustments to the 2002 Wildfire emissions. This in turn will effect the 2003 and 2004 total emissions.

Updates since December 4, 2013:

2012 & 2013 Puerto Rico, Virgin Islands and Tribal data were held constant from the 2011 NEI for all pollutants and tiers.2013 EGU NOx and SO2 emissions were updating using CAMD's final estimates.

Onroad & Nonroad updates for 2007, 2009 and 2010 from MOVES.2006 mobile emissions were recalculated using interpolation between 2005 MOVES data and 2007 MOVES.2009 & 2010 non-mobile emissions were recalculated using interpolation between NEI 2008v3 and NEI 2011v1.

Projected 2020 inventory for mobile emissions were used to calculate 2012 and 2013 onroad and nonroad estimates.2012 and 2013 emissions for non-EGU and non-mobile are held constant from 2011.

Added 2014v2 and recalculated emissions for 2012 & 2013 emissions. Updated 2015-2017 SO2 and NOx electric generating unit emissions to the most recent CAMD available data. States with data not available from CAMD were pulled forward from 2014v2 NEI. 2015-2017 mobile emissions were calculated using interpolation between 2014v2 NEI and the 2016 modeling files. The modeling files did not include data for locomotive, commercial marine vessels and aircrafts. These emissions were pulled forward from the 2014v2 NEI and held constant for 2015-2017.

6. Miscellaneous - New submittals, limited methodology changes in unpaved road dust, fertilizer EFs updated, reintroduced precip-adjustment based on v1, new livestock dust, livestock waste errors fixed. These changes resulted in noticeable if not significant changes in CO, PM10, PM2.5, SO2, VOC & NH3.

Updated 2011 NEI v1 with 2011 NEI v2. 2009 & 2010 non-mobile emissions recalculated as a result of the 2011 update. Updated 2012, 2013 and 2014 SO2 and NOX electric generating units emissions to the most recent CAMD available data.

Added Puerto Rico, Virgin Islands and Tribal data back into the trend line. These were discovered to be included in the data prior to 2002 and thus were added back into 2002-present. These data were estimated using interpolation for interim years and held constant after 2011.

Puerto Rico, Virgin Islands and Tribal data were not present in the MOVES database or for NOx and SO2 CAMD replacements. The added territories were taken from the NEI years and interpolated values and then appended to the other data sources used for updating.

Updates since June 6, 2013: Now using NEI 2011 v1 at the Tier 1 level.

CEM data for 2013 is currently only available for the first three quarters of the year. The percent change from the third to fourth quarters in 2012 were used to estimate the final quarter of 2013. AK and HI CEM data are not provided from CAMD and are held constant from 2011.

2006 and 2007 were recalculated using interpolation between NEI 2005 v2 and NEI 2008 v3.2002 and 2005 MOVES data were used to update 2002-2007.2012 CEM annual data were used to update the previous estimate.

Updates since June 12, 2012: Now using NEI 2008 v3 at the Tier 1 level.

Updates since June 14, 2011: Now using NEI 2008v2 at the Tier 1 level. Adjusted "Open burning" SCCs in 2005 to be more in align with 2008 wildfires.

This update affects emissions for year 2006 and after.The NEI 2005 v2 and the 2008 NEI v2 are applied to recalculate 2006 and 2007 as an interpolation between 2005v2 and 2008v2.2009-2012 values were filled with 2008v2 emissions (flat lined) except where noted because presently there is no comprehensive projected inventory available for interpolation based off the NEI 2008v2 inventory.EGU (electric generating utility) NOx and SO2 emissions for 2009-2011 were updated with continuous emissions monitoring (CEMs) data from the EPA's Acid Rain Program (CAMD) emissions database.CEM data for 2012 is currently only available for the first three quarters of the year. The percent change from the third to fourth quarters in 2011 were used to estimate the final quarter of 2012. Alaska and Hawaii CEM data are not provided from CAMD and are held constant from 2008.Projected 2012 inventory data from the 2005-based modeling platform <http://www.epa.gov/ttn/chief/emch/index.html> was used to develop 2009-2012 estimates for the mobile source sectors rather than flat lining and the results were scaled to the 2008v2 emissions to maintain consistency with the flat-line approach for other sectors. The 2009- 2012 onroad and nonroad data were scaled to the 2008 NEI V2 onroad and nonroad sector data at the state pollutant level (and gas and diesel vehicles for onroad). An adjustment was applied to the 2005 NEI unclassified fire emissions to allocate and add those emissions to pre-existing estimate of prescribed fires and wildfires, and provides for a more reasonable exclusion of wildfires for 'anthropogenic only' emissions.The same operation was performed for nonroad mobile used NMIM (NONROAD) model results for monthly-county-SCC, aggregated to state-annual to compute ratios. The 2012 projected inventory was that used for the final US EPA Cross-State Air Pollution Rule and is a product of the 2005 based modeling platform <http://www.epa.gov/ttn/chief/emch/index.html> which supported the Final Transport Rule. The purpose of the Final Transport Rule was to identify upwind states’ emissions that significantly contribute to downwind nonattainment or interfere with downwind maintenance of the 1997 and 2006 fine particle (PM2.5) National Ambient Air Quality Standard (NAAQS) and the 1997 ozone NAAQS. The Cross-State Air Pollution Rule (CSAPR), requires states to significantly improve air quality by reducing power plant emissions that contribute to ozone and/or fine particle pollution in other states.

Emissions in 2008 decreased over 2005 for all pollutants except slight increases for NH3, PM10, and PM2.5.

NH3: The increase in the miscellaneous category come from prescribed fires and primarily from waste disposal, the latter largely due to the addition of municipal/commercial composting emissions.

PM: The increases in the highway vehicle category are associated with the change to the MOVES estimation model, which has higher PM2.5 emissions than previous model MOBILE6 due to temperature impacts on PM2.5 included in MOVES and based on new emissions testing. The increases in the Miscellaneous category are related to increases in dust from agricultural tilling and livestock especially for PM10. The apparent increase in PM2.5 from 2005 to 2008 is also related to a change in methods for computing PM2.5 emissions from paved roads. Specifically, a new method for 2008 paved road emissions was based on truck vehicle miles tracking and road particulate testing in collaboration with industry group for a new emission factor that results in an increase for PM2.5 and decrease for PM10. These increases offset decreases in other sectors.

While slight increases are observed up to 2008, the decrease after 2008 may be in part due to our approach to flat-line several categories in absence of a projection year emissions inventory.

For instance for NH3 the trend in emissions from agriculture activities has been upward. The flatline of the agriculture emissions in the Miscellaneous category from 2008, and the decreases in the other sectors allow for an apparent decrease.

A thorough discussion of the emissions differences for all pollutants and categories is included in the 2008 v2 release documentation, posted at <http://www.epa.gov/ttn/chief/net/2008neiv2/2008_neiv2_tsd_draft.pdf>.

Process taken to update data:1. Retrieve NEI 2014v2 onroad, nonroad, nonpoint & point SCC files.2. Open all files in a text editor that supports large file sizes (for checking total records).3. Import separate datafiles into SAS and use the numbers found in step two to ensure all records imported successfully.4. Combine datasets then check to makse sure all records are there.5. Sum the data to pollutant totals.6. Check pollutant totals against the NEI 2014v2 page or EIS summaries.7. Run the database through our SCC_to_Tier crosswalk. (available at www.epa.gov/scc)8. Check post merge to make sure all SCCs have an assigned Tier.9. Sum data up to pollutant totals again and check totals against EIS summaries or 2014 NEI webpage10. An extra step for checking sums -> added back in removed data and check totals again.11. Sum data up to national/Tier1/pollutant level.12. Take the new 2005 prescribed fire emissions and add those back into the Miscellaneous Tier.13. Interpolate 2009 and 2010 emissions after removal of wildfires.

14. 2008 wildfire emissions are flatlined for 2009 and 2010 while 2011 wildfire emissions are flatlined for 2012 and 2013. 2014 wildfire emissions are held constant for 2015-2017.

15. All emissions are held constant for 2015-2017 using the NEI 2014v2, except for Tiers: Fuel Comb. Elec. Util. (NOx and SO2 only), Highway Vehicles and Off-Highway. For Fuel Comb. Elec. Util NOx and SO2 the data are replaced by emissions obtained from http://camddataandmaps.epa.gov/gdm/index.cfm?fuseaction=emissions.wizard using state level/quick reports. AK, HI, PR, VI and Tribal emissions are not available from CAMD and are retained from the NEI.

16. Highway Vehicles and Off-Highway use MOVES and NONROAD from the modeling files for years: '02, '05, '07, '09, and '10. For 2015-2017 mobile values were interpolated after using the 2017 modeling data (ftp://newftp.epa.gov/air/emismod/2014/v2/2014fd/emissions/). A 2006 modeling file was not available and the mobile portion was found through interpolation between 2005 and 2007.

Carbon Monoxide (CO)

Source Category 1970 1975 1980 1985 1990 1991FUEL COMB. ELEC. UTIL. 237 276 322 291 363 349FUEL COMB. INDUSTRIAL 770 763 750 670 879 920FUEL COMB. OTHER 3,625 3,441 6,230 7,525 4,269 4,587CHEMICAL & ALLIED PRODUCT MFG 3,397 2,204 2,151 1,845 1,183 1,127METALS PROCESSING 3,644 2,496 2,246 2,223 2,640 2,571PETROLEUM & RELATED INDUSTRIES 2,179 2,211 1,723 462 333 345OTHER INDUSTRIAL PROCESSES 620 630 830 694 537 548SOLVENT UTILIZATION NA NA NA 2 5 5STORAGE & TRANSPORT NA NA NA 49 76 28WASTE DISPOSAL & RECYCLING 7,059 3,230 2,300 1,941 1,079 1,116HIGHWAY VEHICLES 163,231 153,555 143,827 134,187 110,255 104,980OFF-HIGHWAY 11,371 14,329 16,685 19,029 21,447 21,934MISCELLANEOUS 7,909 5,263 8,344 7,927 11,122 8,618

Total 204,042 188,398 185,408 176,845 154,188 147,128Wildfires 6,766 4,433 7,622 7,289 10,583 10,583Total without wildfires 197,276 183,965 177,786 169,556 143,605 136,545Miscellaneous without wildfires

Stationary fuel combustion 4,632 4,480 7,302 8,486 5,511 5,856Industrial and other processes 16,899 10,771 9,250 7,216 5,853 5,740Transportation 174,602 167,884 160,512 153,216 131,702 126,914Miscellaneous 7,909 5,263 8,344 7,927 11,122 8,618Total 204,042 188,398 185,408 176,845 154,188 147,128

National Emissions Totals (thousands of tons)

1992 1993 1994 1995 1996 1997 1998 1999 2000 2001350 363 370 372 408 423 451 496 484 485955 1,043 1,041 1,056 1,188 1,162 1,151 1,213 1,219 1,253

4,849 4,181 4,108 4,506 2,741 2,742 2,727 3,829 3,081 3,0881,112 1,093 1,171 1,223 1,053 1,071 1,081 350 361 3722,496 2,536 2,475 2,380 1,599 1,710 1,702 1,255 1,295 1,380371 371 338 348 354 367 366 159 161 162544 594 600 624 561 582 590 571 592 615

5 5 5 6 1 2 2 52 51 5017 51 24 25 70 71 72 163 169 178

1,138 1,248 1,225 1,185 2,904 2,948 3,121 3,019 1,849 1,85199,705 94,431 89,156 83,881 78,606 75,849 73,244 68,708 68,061 63,47622,419 22,904 23,389 23,874 24,358 23,668 23,689 23,316 24,178 24,6776,934 7,082 9,656 7,298 15,016 7,316 7,184 11,410 12,964 8,676

140,895 135,902 133,558 126,778 128,858 117,910 115,380 114,541 114,467 106,2626,389 6,537 9,089 6,705 14,502 6,793 6,654 10,508 12,049 7,744

134,506 129,365 124,469 120,073 114,356 111,117 108,726 104,033 102,418 98,518

6,154 5,587 5,519 5,934 4,336 4,327 4,329 5,538 4,784 4,8255,683 5,898 5,838 5,791 6,541 6,750 6,934 5,569 4,479 4,609

122,124 117,335 112,545 107,755 102,964 99,517 96,933 92,024 92,239 88,1536,934 7,082 9,656 7,298 15,016 7,316 7,184 11,410 12,964 8,676

140,895 135,902 133,558 126,778 128,858 117,910 115,380 114,541 114,467 106,262

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011657 653 648 643 673 703 728 747 766 784

1,267 1,231 1,192 1,152 1,067 983 898 919 940 9613,550 3,478 3,405 3,331 3,137 2,943 2,749 2,783 2,818 2,852284 259 233 208 200 191 183 178 173 167987 934 882 829 833 836 840 815 791 766357 355 353 351 322 293 265 401 536 672490 505 520 534 498 463 426 397 367 337

2 2 2 2 4 5 7 5 4 2118 114 111 107 78 48 18 21 24 27

1,594 1,581 1,568 1,554 1,495 1,437 1,378 1,289 1,200 1,11151,611 48,683 45,754 42,826 40,046 37,266 33,156 27,437 28,242 27,35522,624 22,384 22,144 21,903 20,373 18,842 17,884 15,921 15,353 14,94918,493 19,415 20,336 15,106 17,111 19,116 21,121 21,839 22,558 23,777

102,033 99,593 97,147 88,546 85,837 83,128 79,655 72,753 73,771 73,76214,052 14,052 14,052 7,900 7,900 7,900 12,200 12,200 12,200 12,70187,981 85,541 83,096 80,646 77,937 75,228 67,455 60,552 61,571 61,0604,442 5,363 6,285 7,206 9,211 11,216 8,921 9,639 10,357 11,076

5,474 5,361 5,244 5,125 4,877 4,629 4,376 4,450 4,524 4,5983,830 3,750 3,669 3,586 3,430 3,274 3,117 3,106 3,094 3,083

74,235 71,066 67,898 64,729 60,419 56,108 51,041 43,358 43,596 42,30418,493 19,415 20,336 15,106 17,111 19,116 21,121 21,839 22,558 23,777

102,033 99,593 97,147 88,546 85,837 83,128 79,655 72,753 73,771 73,762

2012 2013 2014 2015 2016 2017766 748 731 731 731 731950 938 926 926 926 926

2,704 2,556 2,408 2,408 2,408 2,408155 142 129 129 129 129714 662 610 610 610 610682 692 702 702 702 702419 502 584 584 584 584

2 2 2 2 2 221 14 8 8 8 8

1,396 1,682 1,967 1,967 1,967 1,96726,382 25,409 24,437 23,359 20,741 18,89314,387 13,824 13,262 13,264 13,266 13,26923,217 22,656 19,882 19,882 19,882 19,882

71,795 69,827 65,646 64,571 61,955 60,10912,701 12,701 10,487 10,487 10,487 10,48759,093 57,126 55,159 54,084 51,468 49,62210,515 9,955 9,395 9,395 9,395 9,395

4,420 4,242 4,065 4,065 4,065 4,0653,389 3,695 4,001 4,001 4,001 4,001

40,769 39,234 37,698 36,623 34,007 32,16223,217 22,656 19,882 19,882 19,882 19,88271,795 69,827 65,646 64,571 61,955 60,109

Nitrogen Oxide (NOx)

Source Category 1970 1975 1980 1985 1990 1991FUEL COMB. ELEC. UTIL. 4,900 5,694 7,024 6,127 6,663 6,519FUEL COMB. INDUSTRIAL 4,325 4,007 3,555 3,209 3,035 2,979FUEL COMB. OTHER 836 785 741 712 1,196 1,281CHEMICAL & ALLIED PRODUCT MFG 271 221 213 262 168 165METALS PROCESSING 77 73 65 87 97 76PETROLEUM & RELATED INDUSTRIES 240 63 72 124 153 121OTHER INDUSTRIAL PROCESSES 187 182 205 327 378 352SOLVENT UTILIZATION 0 0 0 2 1 2STORAGE & TRANSPORT 0 0 0 2 3 6WASTE DISPOSAL & RECYCLING 440 159 111 87 91 95HIGHWAY VEHICLES 12,624 12,061 11,493 10,932 9,592 9,449OFF-HIGHWAY 2,652 2,968 3,353 3,576 3,781 3,849MISCELLANEOUS 330 165 248 310 369 286

Total 26,882 26,378 27,080 25,757 25,527 25,180Wildfires NA NA NA NA 362 247Total without wildfires 26,883 26,377 27,079 25,757 25,165 24,933Miscellaneous without wildfires 7 39

Stationary fuel combustion 10,061 10,486 11,320 10,048 10,894 10,779Industrial and other processes 1,215 698 666 891 891 817Transportation 15,276 15,029 14,846 14,508 13,373 13,298Miscellaneous 330 165 248 310 369 286Total 26,882 26,378 27,080 25,757 25,527 25,180

National Emissions Totals (thousands of tons)

1992 1993 1994 1995 1996 1997 1998 1999 2000 20016,504 6,651 6,565 6,384 6,164 6,276 6,232 5,721 5,330 4,9173,071 3,151 3,147 3,144 3,151 3,101 3,050 2,709 2,723 2,7571,353 1,308 1,303 1,298 1,197 1,177 1,101 768 766 779163 155 160 158 125 127 129 102 105 10781 83 91 98 83 89 89 86 89 94

148 123 117 110 139 143 143 120 122 124361 370 389 399 433 460 467 451 479 504

3 3 3 3 2 3 3 4 4 45 5 5 6 15 16 16 14 15 1696 123 114 99 153 157 163 162 129 130

9,306 9,162 9,019 8,876 8,733 8,792 8,619 8,371 8,394 7,7743,915 3,981 4,047 4,113 4,179 4,178 4,156 4,084 4,167 4,156255 241 390 267 412 187 179 251 276 184

25,261 25,356 25,350 24,955 24,787 24,705 24,348 22,845 22,598 21,549234 234 382 258 405 179 172 236 263 171

25,027 25,122 24,968 24,697 24,382 24,526 24,176 22,609 22,335 21,37821 7 8 9 7 7 8 15 13 13

10,928 11,110 11,015 10,826 10,513 10,554 10,383 9,198 8,819 8,454857 862 879 873 950 994 1,010 940 943 981

13,221 13,143 13,066 12,989 12,912 12,970 12,776 12,456 12,560 11,930255 241 390 267 412 187 179 251 276 184

25,261 25,356 25,350 24,955 24,787 24,705 24,348 22,845 22,598 21,549

2002 2003 2004 2005 2006 2007 2008 2009 2010 20114,709 4,340 3,969 3,792 3,588 3,383 3,144 2,818 2,458 2,0902,041 1,971 1,897 1,820 1,681 1,543 1,399 1,352 1,305 1,258738 736 734 730 682 633 585 575 565 55570 67 64 61 59 57 55 54 53 5169 68 67 66 71 75 79 76 73 71

354 357 355 354 379 405 431 516 601 685429 448 467 482 461 440 416 395 374 353

7 6 5 4 5 6 6 4 3 119 18 17 16 14 12 10 13 16 20

111 122 134 146 130 113 97 92 88 8310,337 9,671 9,004 8,338 7,992 7,646 6,941 6,206 5,701 5,8704,864 4,667 4,471 4,275 3,898 3,521 3,485 3,391 3,315 3,081211 178 146 271 268 265 262 278 295 399

23,959 22,651 21,331 20,355 19,227 18,099 16,909 15,772 14,846 14,519114 114 114 94 94 94 96 96 96 185

23,845 22,537 21,218 20,261 19,133 18,005 16,813 15,675 14,750 14,33497 65 32 177 174 171 165 182 198 215

7,488 7,047 6,600 6,343 5,951 5,559 5,127 4,745 4,328 3,9041,059 1,087 1,109 1,129 1,118 1,108 1,094 1,151 1,207 1,264

15,201 14,338 13,475 12,612 11,890 11,167 10,426 9,598 9,017 8,952211 178 146 271 268 265 262 278 295 399

23,959 22,651 21,331 20,355 19,227 18,099 16,909 15,772 14,846 14,519

2012 2013 2014 2015 2016 20171,965 1,839 1,770 1,465 1,288 1,1551,220 1,182 1,143 1,143 1,143 1,143550 546 541 541 541 54150 49 47 47 47 4770 70 70 70 70 70

696 706 717 717 717 717345 338 330 330 330 330

1 1 1 1 1 115 10 6 6 6 692 101 110 110 110 110

5,540 5,210 4,879 4,445 4,090 3,6952,947 2,813 2,680 2,673 2,666 2,660388 377 301 301 301 301

13,881 13,243 12,596 11,849 11,310 10,776185 185 119 119 119 119

13,696 13,058 12,476 11,730 11,191 10,657204 193 181 181 181 181

3,735 3,567 3,455 3,149 2,972 2,8391,270 1,276 1,282 1,282 1,282 1,2828,487 8,023 7,559 7,118 6,756 6,355388 377 301 301 301 301

13,881 13,243 12,596 11,849 11,310 10,776

Source Category 1970 1975 1980 1985 1990 1991FUEL COMB. ELEC. UTIL. 1,775 1,191 879 280 295 257FUEL COMB. INDUSTRIAL 641 564 679 247 270 233FUEL COMB. OTHER 455 492 887 1,009 631 657CHEMICAL & ALLIED PRODUCT MFG 235 127 148 58 77 68METALS PROCESSING 1,316 825 622 220 214 251PETROLEUM & RELATED INDUSTRIES 286 179 138 63 55 43OTHER INDUSTRIAL PROCESSES 5,832 2,572 1,846 611 583 520SOLVENT UTILIZATION NA NA NA 2 4 5STORAGE & TRANSPORT NA NA NA 107 102 101WASTE DISPOSAL & RECYCLING 999 371 273 278 271 276HIGHWAY VEHICLES 480 456 432 408 387 370OFF-HIGHWAY 164 209 257 304 328 331MISCELLANEOUS 839 569 852 37,736 24,536 24,233

Total 13,022 7,555 7,013 41,323 27,753 27,345Miscellaneous 839 569 852 37,736 24,536 24,233Total without miscellaneous 12,183 6,986 6,161 3,587 3,217 3,112WildfiresTotal without wildfiresMiscellaneous without wildfires

Particulate Matter 10 Micrometers in Diameter and Smaller (PM10)

National Emissions Totals (thousands of tons)

1992 1993 1994 1995 1996 1997 1998 1999 2000 2001257 279 273 268 289 295 229 723 687 696243 257 270 302 238 232 229 317 320 330683 588 570 610 380 381 378 421 465 46771 66 76 67 63 64 65 54 55 57

250 181 184 212 144 151 150 136 140 14843 38 38 40 29 30 30 38 38 39

506 501 495 511 325 336 338 365 378 3945 6 6 6 6 6 6 17 17 18

117 114 106 109 81 83 84 83 84 88278 334 313 287 454 468 488 468 362 363354 337 321 304 287 274 256 241 230 212333 335 337 339 341 337 332 336 322 317

23,958 24,328 25,619 22,765 20,219 20,253 20,307 20,186 20,649 20,580

27,098 27,364 28,608 25,820 22,857 22,909 22,893 23,383 23,747 23,70823,958 24,328 25,619 22,765 20,219 20,253 20,307 20,186 20,649 20,5803,140 3,036 2,989 3,055 2,638 2,656 2,585 3,198 3,098 3,127

2002 2003 2004 2005 2006 2007 2008 2009 2010 2011620 622 625 627 556 484 409 366 323 280339 345 348 350 297 243 189 218 246 275491 482 473 464 439 414 388 400 412 42440 38 37 36 33 29 26 25 23 2281 82 83 83 82 82 81 75 69 6325 26 27 28 29 29 30 32 33 35

976 988 999 1,009 1,032 1,055 1,076 973 870 7668 8 8 8 7 6 5 4 4 460 59 59 58 56 54 51 52 52 52

289 289 289 289 272 255 238 222 207 192402 395 389 383 376 370 332 305 279 371362 343 323 304 283 263 260 242 228 223

17,883 17,986 18,089 17,662 17,940 18,218 18,496 18,286 18,076 18,015

21,576 21,664 21,749 21,302 21,401 21,501 21,580 21,199 20,823 20,72317,883 17,986 18,089 17,662 17,940 18,218 18,496 18,286 18,076 18,0153,693 3,679 3,660 3,639 3,461 3,283 3,084 2,913 2,747 2,7081,335 1,335 1,335 805 805 805 1,178 1,178 1,178 1,326

20,241 20,330 20,414 20,497 20,596 20,696 20,402 20,021 19,645 19,39716,548 16,651 16,754 16,857 17,135 17,413 17,318 17,108 16,899 16,689

2012 2013 2014 2015 2016 2017265 249 234 234 234 234278 282 286 286 286 286399 373 348 348 348 34821 20 19 19 19 1961 60 58 58 58 5835 34 33 33 33 33

736 706 677 677 677 6774 4 4 4 4 449 46 43 43 43 43

220 249 277 277 277 277349 326 304 288 276 261211 199 187 186 186 185

17,346 16,677 15,727 15,727 15,727 15,727

19,974 19,226 18,198 18,180 18,167 18,15217,346 16,677 15,727 15,727 15,727 15,7272,628 2,549 2,470 2,453 2,440 2,4251,326 1,326 1,046 1,046 1,046 1,046

18,648 17,900 17,152 17,135 17,122 17,10716,020 15,351 14,681 14,681 14,681 14,681

Source Category 1990 1991 1992 1993 1994 1995FUEL COMB. ELEC. UTIL. 121 105 106 112 108 107FUEL COMB. INDUSTRIAL 177 151 159 172 183 203FUEL COMB. OTHER 611 638 662 568 550 589CHEMICAL & ALLIED PRODUCT MFG 47 43 45 41 49 42METALS PROCESSING 157 197 198 125 125 134PETROLEUM & RELATED INDUSTRIES 27 24 24 22 22 22OTHER INDUSTRIAL PROCESSES 284 264 259 260 256 256SOLVENT UTILIZATION 4 4 5 6 6 5STORAGE & TRANSPORT 42 42 50 46 43 42WASTE DISPOSAL & RECYCLING 234 238 239 288 271 247HIGHWAY VEHICLES 323 308 292 276 261 245OFF-HIGHWAY 300 303 305 307 309 311MISCELLANEOUS 5,233 5,003 4,854 4,926 5,359 4,726

Total 7,560 7,320 7,198 7,149 7,542 6,929Miscellaneous 5,233 5,003 4,854 4,926 5,359 4,726Total without miscellaneous 2,327 2,317 2,344 2,223 2,183 2,203WildfiresTotal without wildfiresMiscellaneous without wildfires

Particulate Matter 2.5 Micrometers in Diameter and Smaller (PM2.5)

National Emissions Totals (thousands of tons)

1996 1997 1998 1999 2000 2001 2002 2003 2004 2005157 161 130 621 587 584 506 509 513 516152 148 147 258 260 267 178 184 189 194356 356 354 400 447 449 445 437 429 42239 39 40 45 46 47 30 30 29 29

101 106 105 115 118 125 54 56 58 6017 17 17 27 27 28 18 19 20 21

180 186 189 245 254 264 354 365 376 3875 5 5 17 17 17 7 7 7 730 31 31 41 42 44 23 24 24 25

427 439 459 440 333 334 268 268 267 266229 216 199 184 173 157 330 322 315 308313 309 304 307 295 290 338 321 304 287

4,721 4,244 4,280 4,511 4,688 4,390 3,256 3,346 3,437 3,069

6,724 6,256 6,261 7,211 7,288 6,996 5,805 5,888 5,970 5,5924,721 4,244 4,280 4,511 4,688 4,390 3,256 3,346 3,437 3,0692,003 2,012 1,981 2,700 2,600 2,606 2,549 2,542 2,533 2,523

1,131 1,131 1,131 6734,674 4,757 4,838 4,9192,125 2,215 2,306 2,396

2006 2007 2008 2009 2010 2011 2012 2013 2014 2015448 379 309 275 240 205 198 190 182 182178 162 146 171 197 223 223 224 224 224408 394 380 391 403 415 391 367 343 34326 23 20 19 18 17 16 15 14 1461 62 63 58 53 48 47 46 44 4422 22 23 25 27 29 29 29 29 29

372 357 341 319 298 277 273 269 265 2656 5 4 4 4 4 4 4 4 425 24 24 23 22 21 20 18 17 17

246 226 206 192 178 165 187 208 230 230295 283 253 224 199 198 186 175 163 146267 247 236 225 213 210 199 187 176 175

3,383 3,697 4,011 4,061 4,111 4,288 4,172 4,056 3,701 3,701

5,736 5,881 6,014 5,988 5,964 6,100 5,943 5,787 5,392 5,3743,383 3,697 4,011 4,061 4,111 4,288 4,172 4,056 3,701 3,7012,353 2,184 2,003 1,927 1,853 1,812 1,772 1,731 1,691 1,673673 673 999 999 999 1,125 1,125 1,125 886 886

5,063 5,208 5,016 4,989 4,965 4,974 4,818 4,662 4,506 4,4882,710 3,024 3,012 3,062 3,113 3,163 3,047 2,931 2,814 2,814

2016 2017182 182224 224343 34314 1444 4429 29

265 2654 417 17

230 230132 116174 174

3,701 3,701

5,359 5,3433,701 3,7011,658 1,642886 886

4,473 4,4562,814 2,814

Sulfur Dioxide (SO2)

Source Category 1970 1975 1980 1985 1990 1991FUEL COMB. ELEC. UTIL. 17,398 18,268 17,469 16,272 15,909 15,784FUEL COMB. INDUSTRIAL 4,568 3,310 2,951 3,169 3,550 3,256FUEL COMB. OTHER 1,490 1,082 971 579 831 755CHEMICAL & ALLIED PRODUCT MFG 591 367 280 456 297 280METALS PROCESSING 4,775 2,849 1,842 1,042 726 612PETROLEUM & RELATED INDUSTRIES 881 727 734 505 430 378OTHER INDUSTRIAL PROCESSES 846 740 918 425 399 396SOLVENT UTILIZATION NA NA NA 1 0 0STORAGE & TRANSPORT NA NA NA 4 7 10WASTE DISPOSAL & RECYCLING 8 46 33 34 42 44HIGHWAY VEHICLES 273 334 394 455 503 469OFF-HIGHWAY 278 301 323 354 371 379MISCELLANEOUS 110 20 11 11 12 12

Total 31,218 28,044 25,926 23,307 23,077 22,375Wildfires NA NA NA NA 12 12Total without wildfires 31,218 28,044 25,926 23,307 23,065 22,363Miscellaneous without wildfires 110 20 11 11 0 0

Stationary fuel combustion 23,456 22,660 21,391 20,020 20,290 19,795Industrial and other processes 7,101 4,729 3,807 2,467 1,901 1,720Transportation 551 635 717 809 874 848Miscellaneous 110 20 11 11 12 12Total 31,218 28,044 25,926 23,307 23,077 22,375

National Emissions Totals (thousands of tons)

1992 1993 1994 1995 1996 1997 1998 1999 2000 200115,416 15,189 14,889 12,080 12,767 13,195 13,416 12,583 11,396 10,8503,292 3,284 3,218 3,357 2,849 2,805 2,740 2,135 2,139 2,243784 772 780 793 636 648 586 620 628 642278 269 275 286 255 259 261 325 338 342615 603 562 530 389 407 405 304 313 332416 383 379 369 335 344 342 312 316 319396 392 398 403 386 409 415 382 410 429

1 1 1 1 1 1 1 1 1 19 5 2 2 5 5 5 6 6 744 71 59 47 32 33 34 34 34 35

436 402 369 335 302 304 300 300 260 248385 392 399 406 413 422 432 475 437 44010 10 15 10 15 7 6 67 70 44

22,082 21,773 21,346 18,619 18,385 18,840 18,944 17,545 16,347 15,9329 9 14 10 15 6 6 67 69 44

22,073 21,764 21,332 18,609 18,370 18,834 18,939 17,478 16,278 15,8881 1 1 0 0 0 0 0 0 0

19,492 19,245 18,887 16,230 16,252 16,649 16,743 15,338 14,163 13,7351,759 1,724 1,676 1,638 1,403 1,459 1,464 1,364 1,418 1,464821 794 768 741 715 725 732 776 697 68810 10 15 10 15 7 6 67 70 44

22,082 21,773 21,346 18,619 18,385 18,840 18,944 17,545 16,347 15,932

2002 2003 2004 2005 2006 2007 2008 2009 2010 201110,436 10,343 10,250 10,404 9,546 8,687 7,792 6,762 5,696 4,6251,786 1,780 1,763 1,735 1,514 1,293 1,069 938 807 676579 581 582 582 485 388 291 267 243 219259 257 254 251 229 207 185 165 146 127213 200 187 175 175 176 177 166 155 144257 237 218 199 182 166 149 139 129 119325 337 349 361 325 289 253 231 210 188

0 0 0 0 0 1 1 1 0 05 4 3 3 4 5 6 7 8 926 27 28 28 26 24 21 20 18 17

286 248 210 172 107 42 39 36 37 29725 654 582 510 399 287 201 207 121 127135 140 145 126 130 135 139 150 161 198

15,032 14,808 14,571 14,546 13,123 11,699 10,324 9,089 7,732 6,47980 80 80 56 56 56 70 70 70 96

14,952 14,728 14,491 14,490 13,067 11,643 10,254 9,019 7,662 6,38355 60 65 70 74 79 69 80 91 102

12,801 12,704 12,595 12,721 11,544 10,368 9,152 7,967 6,746 5,5201,085 1,062 1,040 1,017 942 867 792 730 667 6051,011 901 792 682 506 329 240 243 158 157135 140 145 126 130 135 139 150 161 198

15,032 14,808 14,571 14,546 13,123 11,699 10,324 9,089 7,732 6,479

2012 2013 2014 2015 2016 20173,359 3,285 3,244 2,255 1,530 1,385629 581 534 534 534 534184 150 116 116 116 116125 124 123 123 123 123131 118 105 105 105 105114 109 104 104 104 104181 174 167 167 167 167

0 0 0 0 0 07 5 3 3 3 322 27 32 32 32 3229 29 28 27 28 27

108 88 69 69 69 69190 182 150 150 150 150

5,079 4,874 4,675 3,685 2,961 2,81596 96 71 71 71 71

4,984 4,778 4,604 3,614 2,889 2,74494 87 79 79 79 79

4,171 4,017 3,893 2,905 2,180 2,035581 558 534 534 534 534137 117 97 96 96 96190 182 150 150 150 150

5,079 4,874 4,675 3,685 2,961 2,815

Volatile Organic Compounds (VOC)

Source Category 1970 1975 1980 1985 1990 1991FUEL COMB. ELEC. UTIL. 30 40 45 32 47 44FUEL COMB. INDUSTRIAL 150 150 157 134 182 196FUEL COMB. OTHER 541 470 848 1,403 776 835CHEMICAL & ALLIED PRODUCT MFG 1,341 1,351 1,595 881 634 710METALS PROCESSING 394 336 273 76 122 123PETROLEUM & RELATED INDUSTRIES 1,194 1,342 1,440 703 611 640OTHER INDUSTRIAL PROCESSES 270 235 237 390 401 391SOLVENT UTILIZATION 7,174 5,651 6,584 5,699 5,750 5,782STORAGE & TRANSPORT 1,954 2,181 1,975 1,747 1,490 1,532WASTE DISPOSAL & RECYCLING 1,984 984 758 979 986 999HIGHWAY VEHICLES 16,910 15,392 13,869 12,354 9,388 8,860OFF-HIGHWAY 1,616 1,917 2,192 2,439 2,662 2,709MISCELLANEOUS 1,101 716 1,134 566 1,059 756

Total 34,659 30,765 31,107 27,403 24,108 23,577Wildfires 917 587 1,024 465 983 678Total without wildfires 33,742 30,178 30,083 26,938 23,125 22,899Miscellaneous without wildfires 184 129 110 101 76 78

Stationary fuel combustion 721 660 1,050 1,569 1,005 1,075Industrial and other processes 14,311 12,080 12,862 10,475 9,994 10,177Transportation 18,526 17,309 16,061 14,793 12,050 11,569Miscellaneous 1,101 716 1,134 566 1,059 756Total 34,659 30,765 31,107 27,403 24,108 23,577

National Emissions Totals (thousands of tons)

1992 1993 1994 1995 1996 1997 1998 1999 2000 200144 45 45 44 50 52 56 54 62 61

187 186 196 206 179 175 174 172 173 176884 762 748 823 893 893 889 919 949 950715 701 691 660 388 388 394 251 254 262124 124 126 125 73 78 78 66 67 71632 649 647 642 477 487 485 457 428 441414 442 438 450 435 438 443 438 454 420

5,901 6,016 6,162 6,183 5,477 5,621 5,149 5,036 4,831 5,0121,583 1,600 1,629 1,652 1,294 1,328 1,327 1,237 1,176 1,1921,010 1,046 1,046 1,067 509 518 535 487 415 4208,332 7,804 7,277 6,749 6,221 5,985 5,859 5,681 5,325 4,9522,754 2,799 2,845 2,890 2,935 2,752 2,673 2,682 2,644 2,622486 556 720 551 1,940 816 718 791 733 532

23,066 22,730 22,570 22,042 20,871 19,530 18,781 18,270 17,512 17,111407 478 638 464 1,870 744 645 667 615 412

22,659 22,252 21,932 21,578 19,001 18,786 18,136 17,603 16,898 16,69979 78 82 87 71 72 72 124 118 120

1,115 993 989 1,073 1,122 1,120 1,120 1,145 1,184 1,18610,379 10,578 10,739 10,779 8,653 8,857 8,411 7,972 7,626 7,81811,086 10,603 10,122 9,639 9,156 8,737 8,533 8,362 7,969 7,574

486 556 720 551 1,940 816 718 791 733 53223,066 22,730 22,570 22,042 20,871 19,530 18,781 18,270 17,512 17,111

2002 2003 2004 2005 2006 2007 2008 2009 2010 201149 49 49 48 47 45 44 43 42 41

152 146 139 133 124 116 107 109 110 1121,523 1,211 900 589 528 467 406 430 453 476249 245 240 235 186 137 88 86 85 8346 47 48 49 45 41 37 36 35 34

601 588 575 562 956 1,350 1,744 2,088 2,431 2,774442 447 452 457 425 394 362 351 340 329

4,278 4,267 4,256 4,245 3,938 3,630 3,299 3,136 2,974 2,8111,484 1,487 1,473 1,442 1,360 1,277 1,193 1,143 1,093 1,043395 395 394 392 323 254 185 167 150 132

4,013 3,823 3,633 3,443 3,464 3,484 3,052 2,756 2,766 2,8723,086 3,013 2,939 2,866 2,746 2,627 2,546 2,370 2,295 2,1573,970 4,193 4,415 3,291 3,759 4,227 4,695 4,879 5,062 5,290

20,289 19,911 19,514 17,753 17,902 18,050 17,759 17,593 17,835 18,1543,213 3,213 3,213 1,868 1,868 1,868 2,847 2,847 2,847 2,891

17,076 16,697 16,300 15,885 16,034 16,183 14,912 14,747 14,988 15,263757 979 1,201 1,424 1,892 2,360 1,849 2,032 2,216 2,399

1,724 1,406 1,088 769 699 628 557 581 605 6287,496 7,476 7,439 7,383 7,234 7,084 6,909 7,008 7,107 7,2077,099 6,836 6,572 6,309 6,210 6,111 5,598 5,125 5,061 5,0293,970 4,193 4,415 3,291 3,759 4,227 4,695 4,879 5,062 5,290

20,289 19,911 19,514 17,753 17,902 18,050 17,759 17,593 17,835 18,154

2012 2013 2014 2015 2016 201740 39 38 38 38 38

111 110 110 110 110 110441 407 372 372 372 37281 79 77 77 77 7732 31 29 29 29 29

2,898 3,021 3,145 3,145 3,145 3,145335 340 346 346 346 346

2,891 2,972 3,052 3,052 3,052 3,052921 798 675 675 675 675165 199 233 233 233 233

2,707 2,542 2,378 2,231 1,993 1,8012,025 1,892 1,760 1,726 1,691 1,6565,235 5,179 4,699 4,699 4,699 4,699

17,882 17,610 16,913 16,731 16,459 16,2322,891 2,891 2,466 2,466 2,466 2,466

14,991 14,719 14,447 14,265 13,993 13,7662,344 2,288 2,232 2,232 2,232 2,232

592 556 519 519 519 5197,323 7,440 7,557 7,557 7,557 7,5574,732 4,435 4,138 3,956 3,684 3,4575,235 5,179 4,699 4,699 4,699 4,699

17,882 17,610 16,913 16,731 16,459 16,232

Ammonia Emissions (NH3)

Source Category 1990 1991 1992 1993 1994 1995FUEL COMB. ELEC. UTIL. 0 0 0 0 0 0FUEL COMB. INDUSTRIAL 17 17 17 18 18 18FUEL COMB. OTHER 8 8 8 8 8 8CHEMICAL & ALLIED PRODUCT MFG 183 183 183 183 183 183METALS PROCESSING 6 6 6 6 6 6PETROLEUM & RELATED INDUSTRIES 43 43 43 43 43 43OTHER INDUSTRIAL PROCESSES 38 38 39 39 40 40SOLVENT UTILIZATION NA NA NA NA NA NA STORAGE & TRANSPORT 0 0 0 0 0 0WASTE DISPOSAL & RECYCLING 82 86 89 93 93 93HIGHWAY VEHICLES 155 169 182 195 209 222OFF-HIGHWAY 31 35 35 36 36 37MISCELLANEOUS 3,757 3,799 3,841 3,897 3,953 4,009

Total 4,320 4,384 4,443 4,518 4,589 4,659Miscellaneous 3,757 3,799 3,841 3,897 3,953 4,009Total without miscellaneous 563 585 602 621 636 650WildfiresTotal without wildfiresMiscellaneous without wildfires

Stationary fuel combustion 25 25 25 26 26 26Industrial and other processes 352 356 360 364 365 365Transportation 186 204 217 231 245 259Miscellaneous 3,757 3,799 3,841 3,897 3,953 4,009Total 4,320 4,384 4,443 4,518 4,589 4,659

National Emissions Totals (thousands of tons)

1996 1997 1998 1999 2000 2001 2002 2003 2004 20056 6 8 11 11 11 29 28 27 2534 33 33 31 31 31 17 18 19 207 7 6 8 8 8 18 18 18 18

123 125 130 25 26 27 23 21 20 185 5 5 2 2 2 3 3 3 316 17 17 9 10 10 3 2 2 143 45 45 48 50 52 177 178 179 1790 0 0 0 0 0 0 0 0 01 1 1 5 5 5 1 1 1 184 84 86 82 83 85 26 26 27 28

236 265 256 267 275 278 155 152 149 14634 34 35 3 3 3 3 3 3 3

4,138 4,195 4,318 4,366 4,403 3,177 3,539 3,554 3,570 3,4903,994 4,005 4,016 3,932

0 0 0 0

4,727 4,817 4,940 4,857 4,907 3,689 3,994 4,005 4,016 3,9324,138 4,195 4,318 4,366 4,403 3,177 3,539 3,554 3,570 3,490589 622 622 491 504 512 455 451 446 441

225 225 225 1303,769 3,780 3,791 3,8023,314 3,330 3,345 3,361

47 46 47 50 50 50 64 64 63 63272 277 284 171 176 181 233 232 231 230270 299 291 270 278 281 158 155 152 149

4,138 4,195 4,318 4,366 4,403 3,177 3,539 3,554 3,570 3,4904,727 4,817 4,940 4,857 4,907 3,689 3,994 4,005 4,016 3,932

2006 2007 2008 2009 2010 2011 2012 2013 2014 201526 27 28 27 26 25 25 25 26 2617 15 13 13 13 13 14 15 15 1533 48 63 64 65 66 66 67 67 6718 18 19 20 22 23 23 23 22 222 2 2 2 1 1 1 1 1 11 1 1 1 1 1 1 2 2 2

138 97 56 49 41 34 30 26 22 220 0 0 1 1 1 1 1 1 12 4 5 5 6 6 6 6 5 541 54 67 57 46 36 34 32 30 30

146 147 138 133 128 124 119 114 109 1053 3 4 3 3 3 3 3 3 3

3,648 3,805 3,963 3,940 3,917 3,899 3,700 3,500 3,269 3,2694,077 4,222 4,359 4,315 4,271 4,232 4,023 3,813 3,572

0 0 0 0 0 0 0 0 0

4,077 4,222 4,359 4,315 4,271 4,232 4,023 3,813 3,572 3,5693,648 3,805 3,963 3,940 3,917 3,899 3,700 3,500 3,269 3,269429 417 397 375 354 333 323 313 303 300130 130 198 198 198 203 203 203 172 172

3,947 4,092 4,161 4,117 4,073 4,029 3,819 3,610 3,401 3,3983,518 3,675 3,765 3,742 3,719 3,696 3,497 3,297 3,098 3,098

77 90 104 104 104 104 106 107 108 108204 177 151 135 118 102 96 89 83 83149 149 141 137 132 127 122 117 112 108

3,648 3,805 3,963 3,940 3,917 3,899 3,700 3,500 3,269 3,2694,077 4,222 4,359 4,315 4,271 4,232 4,023 3,813 3,572 3,569

2016 201726 2615 1567 6722 221 12 222 221 15 530 30

102 993 3

3,269 3,269

3,566 3,5633,269 3,269297 294172 172

3,394 3,3913,098 3,098

108 10883 83

105 1023,269 3,2693,566 3,563