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The Impact of Delaying Ground Level Ozone NAAQS in 2010

The Impact of Delaying Ground Level Ozone NAAQS in 2010. Current Standard v. Proposed Standard. Current standard is the 8 hour GLO (ground level ozone) be below .075ppm Average over 8 hours 4 th highest such number average with the similar number from prior 2 years

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The Impact of Delaying Ground Level Ozone NAAQS in 2010

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  1. The Impact of Delaying Ground Level Ozone NAAQS in 2010

  2. Current Standard v. Proposed Standard • Current standard is the 8 hour GLO (ground level ozone) be below .075ppm • Average over 8 hours • 4th highest such number average with the similar number from prior 2 years • Proposed Standard had two prongs – • Reduce the .075 ppm to .065 (approx). • Introduce a 1 hr standard aimed at peak levels of ozone.

  3. Impact of NOT Tightening • Main Conclusions: • About half of jurisdictions are out of compliance with current .075 standard ->tightening would merely have made them further out of compliance • Monitoring GLO itself may not even be an effective approach to GLO reduction • Even in the absence of stricter standards progress can and should be made

  4. Current Standard Already Challenging Jurisdictions • More than half of jurisdictions don’t meet current standard • Long term trend is down

  5. Directly Tracking GLO – May Not be the Way to Go • GLO is the result of Nox and VOCS. • Need both precursors to be controlled • Either may be dominant • GLO may “happen” far from precursor emissions • Other tool in the tool box – • Separate precursors in place and time! • E.g. target VOCs for night production • Separate emitters

  6. Targeted Reduction- Illustrative Case Peak NOx emission on hottest days – worst possible case for GLO production Taking action to reduce these (based on other NAAQS will lower GLO in CT)

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