1-Hour NO 2 Near Roadway Monitoring

1. April 12, 2011 1-Hour NO2 Near Roadway Monitoring Elfego Felix Air Quality Analysis Office EPA Region 9

2. Overview • New Primary NO2 standard • Monitoring requirements & site criteria • Near-road pilot project & EPA guidance • Upcoming new monitoring requirements

3. New Primary NO2 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 98th 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

4. Monitoring Requirements Near-roadway • Minimum of one monitor required for Core Based Statistical Areas (CBSA) ≥ 500K • 2nd 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

5. Near-Road Map

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 E • Site selection considerations (as outlined in FR) • Highest AADT, fleet mix, congestion patterns, terrain, geographic location, & meteorology, susceptible populations

7. Near-Roadway Pilot Project Objectives • To 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 community

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

9. Technical Assistance Document (TAD) • How-to and best practices guide to near-road NO2 site selection • Multi-pollutant focus • Draft by Summer 2011 • To be submitted to CASAC AMMS for review • Target final timeframe for Fall 2011

10. Other Upcoming/Proposed Monitoring Requirements Pb (12/27/2011)- • Industrial sources ≥ 0.5tpy • Urban NCore sites (CBSA ≥ 500K) • 15 additional airports selected for a 1 yr monitoring study SO2 (1/1/2013)- • Population-weighted based on NEI data • 163 total estimated nationwide CO (Proposed 1/1/2013)- • Collocated with NO2 near-road sites with CBSA ≥ 1M

11. Questions?!

12. Appendix A: NO2 Monitoring Areas

13. Appendix A (cont.)

14. Appendix A (cont.)

15. Appendix A (cont.)

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