1. Elfego Felix Air Quality Analysis Office EPA Region 9 1-Hour NO 2 Near Roadway Monitoring April 12, 2011

2. Overview New Primary NO 2 standard Monitoring requirements & site criteria Near-road pilot project & EPA guidance Upcoming new monitoring requirements 2

3. New Primary NO 2 NAAQS Annual standard– unchanged 53 ppb, 3 year average Community level exposures No violating areas (since 1998) 1-hour standard– effective April 12, 2010 100 ppb, 3 year average of 98 th percentile of daily max Near-roadway, highest concentration focus Unknown how extensive nonattainment may be Secondary Standard – under revision Final expected March 2012 Focused on aquatic acidification 3

4. Monitoring Requirements Near-roadway Minimum of one monitor required for Core Based Statistical Areas (CBSA) ≥ 500K 2 nd monitor required for CBSA ≥ 2.5M, or At road segments with Annual Average Daily Traffic (AADT) ≥ 250,000 EPA authorized to require additional monitors as deemed necessary 126 estimated nationwide Community wide monitoring Minimum of one monitor in urban areas with population ≥ 1M A minimum of 53 sites to assess community wide levels in urban sites Current network may meet community wide monitoring requirements Minimum of 40 additional monitors nationwide for susceptible and vulnerable populations Regional Administrators to carry process in collaboration with states 4

5. Near-Road Map 5

6. Near-Roadway site criteria Siting criteria Within 50m in horizontal (as close as “practicable”), 2-7m vertical inlet Unrestricted airflow, with no obstacles above/between the road and inlet Siting criteria described in 40 CFR Appendix E40 CFR Appendix E Site selection considerations (as outlined in FR) Highest AADT, fleet mix, congestion patterns, terrain, geographic location, & meteorology, susceptible populations 6

7. Near-Roadway Pilot Project Objectives 1) To allow state and local air monitoring stakeholders to evaluate, improve, and document the near-road monitor siting process, and 2) Provide S/L and EPA first-hand experience in the full installation of a near-road monitoring station to share with the air monitoring community 7

8. Pilot 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, & congestion roadway design, terrain, & meteorology handled on a case-by-case basis EPA Guidance = TAD 8

9. Technical Assistance Document (TAD) How-to and best practices guide to near-road NO 2 site selection Multi-pollutant focus Draft by Summer 2011 To be submitted to CASAC AMMS for review Target final timeframe for Fall 2011 9

10. Other Upcoming/Proposed Monitoring Requirements Pb (12/27/2011)- Industrial sources ≥ 0.5 tpy Urban NCore sites (CBSA ≥ 500K) 15 additional airports selected for a 1 yr monitoring study SO 2 (1/1/2013)- Population-weighted based on NEI data 163 total estimated nationwide CO (Proposed 1/1/2013)- Collocated with NO 2 near-road sites with CBSA ≥ 1M 10

11. Questions?! 11

12. Appendix A: NO 2 Monitoring Areas 12

13. Appendix A (cont.) 13

14. Appendix A (cont.) 14

15. Appendix A (cont.) 15

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17. Appendix B: 15 1-year Pb study airports 1. Merrill Field Anchorage, AK 2. Pryor Field Regional Limestone, AL 3. Palo Alto Airport of Santa Clara County Santa Clara, CA 4. McClellan-Palomar San Diego, CA 5. Reid-Hillview Santa Clara, CA 6. Gillespie Field San Diego, CA 7. San Carlos San Mateo, CA 8. Nantucket Memorial Nantucket, MA 9. Oakland County International Oakland, MI 10. Republic Suffolk, NY 11. Brookhaven Suffolk, NY 12. Stinson Municipal Bexar, TX 13. Northwest Regional Denton, TX 14. Auburn Municipal King, WA 15. Harvey Field Snohomish, WA