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Review of Northeast Texas 2012 Ozone Season

Presentation to the NETAC Policy and Technical Committees

June 13, 2013

Sue Kemball-Cook, Wilson Santamaria and Greg YarwoodENVIRON

skemballcook@environcorp.com

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Today’s Presentation

• Update on ozone Design Values and trends • Implications for attainment• Review of 2012 ozone season

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Northeast Texas CAMS Monitors

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• In 2012, 4th high value decreased relative to 2011 for all three monitors

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• All three monitors attain the 2008 NAAQS using 2008-2010 data• Longview does not attain if 2009-2011 or 2010-2012 data are considered

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4th High Ozone Values Needed to Attain the NAAQS in 2013

• Table shows 4th high value needed in 2013 for monitor to achieve current NAAQS of 75 ppb– 4th high of 67 ppb or lower at Longview produces DV

that attains• Lowest 4th high at C19 was 71 ppb in 2008

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2012 Temperatures

• 2012 was the warmest spring on record in Texas• Texas temperatures were warmer than usual in

summer

http://www.ncdc.noaa.gov/sotc

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2012 Days with 8-hour Ozone > 75 ppb

Maximum 8-hour Ozone (ppb)Day Longview Tyler Karnack

June 26 82 84 71June 27 79 80 80

August 9 68 75 77August 10 70 80 70August 11 83 76 66August 14 78 58 62

4th high value 78 76 72

Shading shows monitor with highest daily maximum 8-hour ozone on that day

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2012 Days with 8-hour Ozone > 75 ppb

PossibleHRVOCImpact

26-Jun LV, TYRegional background ~65 ppb, Tyler urban plume impact at Tyler

27-Jun LV,TY,KNRegional background ~75 ppb, Power plant impact at Longview

9-Aug TY,KN Regional background ~70 ppb10-Aug TY x Regional background ~65 ppb11-Aug LV,TY Regional background ~65 ppb14-Aug LV Regional background ~60 ppb

Day

x x

xsmall

Monitor(s)

small x

Unknown Local Contribution

≥60 ppb Regional Contribution

Power Plant Impact

Xx

x ?xx

Comments

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REVIEW OF 2012 OZONE SEASON

June 26, 2012

• High ozone at Tyler and Longview• High regional background ~65

ppb• Late afternoon peak at Tyler is

likely due to Tyler urban plume• Little SO2 at Tyler and Longview

Back Trajectories Ending at 4pm Longview Tyler

1-Hour Ozone

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Longview KarnackTyler

Location 8hr-O3

(ppb)

1hr-O3 (max-ppb/time)

Longview 82 93/3pm

Tyler 84 107/4pm

Karnack 71 73/9am,10am

June 26 HYSPLIT Back Trajectories

June 27, 2012

• High ozone at all three monitors

• Very high (~75 ppb) background ozone

• Morning power plant impact at Longview

Back Trajectories Ending at 4pm Longview Tyler

1-Hour Ozone

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Location 8hr-O3

(ppb)

1hr-O3 (max-ppb/time)

Longview 79 82/11am, 1pm, 3pm

Tyler 80 86/1pm

Karnack 80 87/4pm

June 27 HYSPLIT Back TrajectoriesLongview KarnackTyler

August 9, 2012

• Very high (~70 ppb) background ozone

• Unusual wind speed/direction• Small amounts of SO2 present at

Longview and Tyler indicate power plants contribute but are not primary cause of high ozone

Back Trajectories Ending at 5 pm

Longview Tyler

1-Hour Ozone

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Location 8hr-O3

(ppb)

1hr-O3 (max-ppb/time)

Longview 68 74/4pm

Tyler 75 83/3pm

Karnack 77 83/5pm

August 9, 2012: HYSPLIT Back TrajectoriesLongview KarnackTyler

August 10, 2012

• Very high (~65 ppb) background ozone• Wind shift• Late afternoon Longview peak may be

HRVOC impact• Early morning SO2 impacts at

Longview and Tyler, but little SO2 present during ozone peaks

Back Trajectories Ending at 5 pm

Longview Tyler

1-Hour Ozone

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August 10: HYSPLIT Back TrajectoriesLongview KarnackTyler

Location 8hr-O3

(ppb)

1hr-O3 (max-ppb/time)

Longview 70 75/4pm

Tyler 80 84/5pm

Karnack 70 76/3pm

August 11, 2012

16 hours back trajectories ending at 4 pm

• Background ozone ~65 ppb• Stagnant winds• SO2 at Longview indicates

power plant contribution in late afternoon

Back Trajectories Ending at 5 pm

Longview Tyler

1-Hour Ozone

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Location 8hr-O3

(ppb)

1hr-O3 (max-ppb/time)

Longview 83 92/4pm

Tyler 76 84/2pm

Karnack 66 71/3pm,4pm

August 11: HYSPLIT Back TrajectoriesLongview KarnackTyler

August 14, 2012

• Background ozone ~60 ppb• SO2 at Longview indicates

power plant contribution to late afternoon peak

Back Trajectories Ending at 1 pm

Longview Tyler

1-Hour Ozone

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Location 8hr-O3

(ppb)

1hr-O3 (max-ppb/time)

Longview 78 84/1pm

Tyler 58 69/4pm

Karnack 62 67/5pm

August 14: HYSPLIT Back TrajectoriesLongview KarnackTyler