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NAAQS and Criteria Pollutant Trends Update

NAAQS and Criteria Pollutant Trends Update. US EPA Region 10. Overview. Clean Air Act - Sections 108 and 109 Govern the establishment and revision of the National Ambient Air Quality Standards (NAAQS)

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NAAQS and Criteria Pollutant Trends Update

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  1. NAAQS and Criteria Pollutant Trends Update US EPA Region 10

  2. Overview • Clean Air Act - Sections 108 and 109 • Govern the establishment and revision of the National Ambient Air Quality Standards (NAAQS) • CAA requires periodic review of the science upon which the standards are based and the standards themselves • NAAQS Review Process • Status of NAAQS with pollutant trends

  3. Ozone NAAQS Update • On March 12, 2008, EPA established new primary and secondary NAAQS for ground level ozone at 0.075 ppm. • The process of designating areas at attainment or nonattainment was on schedule to be completed by March 12, 2010. • Several environmental organizations and industry groups petitioned the DC Court of appeals to review the 2008 NAAQS.

  4. Ozone NAAQS Update • On Sept 15th, EPA announced that we will reconsider the 2008 standards for ground-level ozone to ensure the standards are clearly grounded in science and protect public health and welfare with an adequate margin of safety • The ozone standards set in 2008 were not as protective as recommended by EPA’s panel of science advisors • Recommended 0.060-0.070 ppm for primary standards • Recommended the W126 index for secondary standards • The Agency will propose any needed revisions to the ozone standards by December 2009 and issue a final decision by August 2010. We will work with our states to accelerate the implementation of any new standards.

  5. Puget Sound Ozone Sites

  6. WA OzoneTrends

  7. WA Ozone Trends

  8. WA OzoneTrends

  9. WA Ozone Summary • Mud Mtn appears to be trending up • Pack Forest flat but mimics Mud Mtn • Vancouver up, down, and up again • Other WA sites trending down

  10. PM2.5 NAAQS Update • PM2.5 Final Designations for 2006 24 hour NAAQS ongoing • Originally had 7 areas; now will have 5 areas • One site in WA in Pierce County based on L Street monitor in Tacoma • SIP’s will be due 3 years from now and attainment of standards in less than 5 years • Next NAAQS for PM2.5 review due out in early 2011

  11. Washington PM2.5 Trends

  12. WA PM2.5 Summary • Washington sites are fairly flat, though.. • Tacoma trending up • Marysville is trending down • Most areas show high reads due to wood combustion during winter coupled with stagnation conditions • SIP is due for the WA State NAA in Pierce County 3 years from effective date

  13. NO2 NAAQS • On June 26, 2009 EPA proposed to strengthen the primary NAAQS for nitrogen dioxide (NO2) from the existing NO2 standard of an annual average of 53 parts per billion (ppb). • EPA is proposing to: • add a 1-hour NO2 standard at a level between 80-100 ppb; and • retain an annual average NO2 standard at a level of 53 ppb • Under a separate review, EPA is considering the need for changes to the secondary NO2 standard • EPA is also proposing changes to the NO2 air quality monitoring network including monitors to measure: • Peak, short-term concentrations to support the proposed 1-hour standard – typically near major roads in urban areas, and • highest concentrations of NO2 that occur over wider areas • The public comment period ended this month and final rule will be out Jan 2010.

  14. NO2 Monitoring Sites

  15. NO2 NAAQS Trends

  16. 1.5 – 3.3 miles from site to sources

  17. Lead Pb NAAQS • New standard finalized in FR on 11/12/08 • 0.15 µg/m3 or less meets standard • Mean value averaged over 3 months • Look at 3 years of data to determine compliance • Pb monitoring in R10 stopped as of 2003. • Last exceedance was 2nd quarter 1998 • Harbor Island, Seattle - 2.03 µg/m3 • Source has since shut down operations • Therefore unclear how R10 will be effected

  18. CO NAAQS • Standard review ongoing under the following schedule: • Final Integrated Review Plan - August 2008 • Scope and Methods for Risk/Exposure Assessment - April 2009 • Final Integrated Science Assessment - January 2010 • Final Risk and Exposure Assessment – May 2010 • Proposed/Final rulemaking – October 2010/ May 2011

  19. Carbon Monoxide Trends • 8 hour standard is 9 ppm – not to be exceeded more than 1x/year • 1 hour standard is 35 ppm - not to be exceeded more than 1x/year • Network has been drastically reduced • No violation of either standard in R10 in the 21 century through CY 2008.

  20. CO Trends

  21. CO Trends

  22. SO2 NAAQS • Standard review ongoing under the following schedule: • Final Integrated Review Plan - October 2007 • Final Integrated Science Assessment - September 2008 • Final Risk/Exposure Assessment methodology - January 2009 • Policy/Final rulemaking - March 2010

  23. Questions

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