1-Hour NO2 Near Roadway Monitoring

Elfego FelixAir Quality Analysis OfficeEPA Region 91-Hour NO2 Near Roadway MonitoringApril 12, 2011

OverviewNew Primary NO2 standard Monitoring requirements & site criteriaNear-road pilot project & EPA guidanceUpcoming new monitoring requirements

2New Primary NO2 NAAQSAnnual standard unchanged53 ppb, 3 year averageCommunity level exposuresNo violating areas (since 1998)1-hour standard effective April 12, 2010100 ppb, 3 year average of 98th percentile of daily maxNear-roadway, highest concentration focusUnknown how extensive nonattainment may beSecondary Standard under revisionFinal expected March 2012Focused on aquatic acidification3Monitoring RequirementsNear-roadway Minimum of one monitor required for Core Based Statistical Areas (CBSA) 500K2nd monitor required for CBSA 2.5M, orAt road segments with Annual Average Daily Traffic (AADT) 250,000EPA authorized to require additional monitors as deemed necessary126 estimated nationwideCommunity wide monitoringMinimum of one monitor in urban areas with population 1MA minimum of 53 sites to assess community wide levels in urban sitesCurrent network may meet community wide monitoring requirementsMinimum of 40 additional monitors nationwidefor susceptible and vulnerable populationsRegional Administrators to carry process in collaboration with states4Appendix A (slides 12-15) includes a list of areas that will be requiring NO2 monitors (both near road and community). Slide 16 displays a Nationwide map of community wide monitoring locations.4Near-Road Map

5Near-Roadway site criteria Siting criteriaWithin 50m in horizontal (as close as practicable), 2-7m vertical inletUnrestricted airflow, with no obstacles above/between the road and inletSiting criteria described in 40 CFR Appendix ESite selection considerations (as outlined in FR)Highest AADT, fleet mix, congestion patterns, terrain, geographic location, & meteorology, susceptible populations640 CFR Appendix E is a link to the e-CFR. Internet access would be necessary to access it.6Near-Roadway Pilot Project ObjectivesTo allow state and local air monitoring stakeholders to evaluate, improve, and document the near-road monitor siting process, and Provide S/L and EPA first-hand experience in the full installation of a near-road monitoring station to share with the air monitoring community77Pilot Project (cont.)Pilot participants:Albuquerque, NM (City of Albuquerque)Baltimore, MD (Maryland Dept. of Env.)Boise, ID (Idaho DEQ)Miami, FL (Broward County)Tampa, FL (Hillsborough County)Pilot focus is to evaluate road segment ranking criteria for AADT, fleet mix, & congestionroadway design, terrain, & meteorology handled on a case-by-case basisEPA Guidance = TAD8Reference Appendix B8Technical Assistance Document (TAD)How-to and best practices guide to near-road NO2 site selectionMulti-pollutant focusDraft by Summer 2011To be submitted to CASAC AMMS for reviewTarget final timeframe for Fall 2011

9Other Upcoming/Proposed Monitoring RequirementsPb (12/27/2011)-Industrial sources 0.5 tpyUrban NCore sites (CBSA 500K)15 additional airports selected for a 1 yr monitoring studySO2 (1/1/2013)-Population-weighted based on NEI data163 total estimated nationwideCO (Proposed 1/1/2013)-Collocated with NO2 near-road sites with CBSA 1M10-Dates next to pollutants are dates for monitoring commencement-List of 15 additional airports included in Appendix B (slide 54)-List of 163 SO2 required monitors is linked to bullet point 163 total estimated nationwide10Questions?!11Appendix A: NO2 Monitoring Areas12

Appendix A (cont.)13

Appendix A (cont.)14

Appendix A (cont.)15

16Appendix B: 15 1-year Pb study airportsMerrill Field Anchorage, AKPryor Field Regional Limestone, ALPalo Alto Airport of Santa Clara County Santa Clara, CAMcClellan-Palomar San Diego, CAReid-Hillview Santa Clara, CAGillespie Field San Diego, CASan Carlos San Mateo, CANantucket Memorial Nantucket, MAOakland County International Oakland, MIRepublic Suffolk, NYBrookhaven Suffolk, NYStinson Municipal Bexar, TXNorthwest Regional Denton, TXAuburn Municipal King, WAHarvey Field Snohomish, WA