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Ozone Pollution

Ozone NAAQS Timelines

Key Dates for Existing and Future Nonattainment Areas
  2008 NAAQS 2015 NAAQS
Emission statement rule, emission inventory, and Moderate area/OTR RACT SIPs July 2014 Late 2019
Marginal area attainment date July 2015

Late 2020

Attainment plans and demonstrations for initial Moderate areas​ July 2015 Late 2020
Attainment plans and demonstrations for initial Serious and above areas July 2016 Late 2021
Moderate area SIPs for 11 reclassified Marginal areas Early 2017 (TBD) --
Moderate area attainment date

July 2018

Late 2023

2008 NAAQS revoked 2018-2019 (TBD) --
 
Anticipated Schedule for 2015 Ozone NAAQS Implementation Rules/Guidance/Tools
Action After NAAQS Promulgation Planned Dates
Final 2015 Ozone NAAQS revision, monitoring rules, exceptional event demonstration schedule, and PSD permit grandfathering provision Upon promulgation October 2015

Propose Exceptional Events Rule revision and guidance on wildfire-related ozone demonstrations​

1 month November 2015

Area designations guidance (including Rural Transport Areas)​

4 months February 2016

Final update to PSD permit modeling guideline (Appendix W; proposed July 2015); MERPs and SIL guidance​

8 months June 2016

Final Exceptional Events Rule revision and guidance on wildfire-related ozone demonstrations​

10 months August 2016
States submit area designation recommendations 12 months October 2016

Interstate ozone transport contribution assessment provided to States​

12 months October 2016

Propose nonattainment area rules/guidance (including area classifications, SIP due dates, nonattainment NSR provisions)​

12 months October 2016

Final designations, classifications, and nonattainment area SIP rules/guidance​

24 months October 2017

Update to transportation conformity guidance​

25 months November 2017

States submit Infrastructure and Transport SIPs​

36 months Late 2018

States submit attainment plans

5-6 years 2020-2021

Nonattainment Area Attainment Dates (Marginal – Extreme)​

5-22 years 2020-2037