1. 1 Air Planning Section EPA Region 6

3. ActionTarget Date EPA Letter to Governors on Designations (120-day letters) December 21, 2011 Designations and Classifications (Proposal)January 2012 Designations and Classifications (Final; effective 60 days after publication) April 2012 Effective date June 2012 Broader Implementation Rule (Proposal)Spring 2012 Broader Implementation Rule (Final)Fall 2012 State Implementation Plans Due (or as directed in implementation rule) NLT 3 years after effective date (June 2015) Next regular review (Proposal)Fall 2013 Next regular review (Final)2014 Ozone NAAQS Tentative Schedule

4. Ozone Classification Timelines ClassificationYears to Attain (from Designation) Marginal3 Moderate6 Serious9 Severe15 – 17 Extreme20

5. SIP Requirements for Ozone Nonattainment Areas Classification/Years to AttainRequirements Extreme (20 years)Clean Fuels and Controls for Boilers Severe (15 – 17 years) Offset VMT Growth Major Source Fee if Area Fails to Attain Serious (9 years) Stage II Gasoline Vapor Recovery Enhanced Monitoring and Enhanced Vehicle I/M Demonstration of Required Emission Reductions Moderate (6 years) Basic Vehicle Inspection and Maintenance Reasonably Available Control Technology & Measures Reasonable Further Progress Emissions Reductions Attainment Demonstration, Contingency Measures Marginal (3 years) Emissions Inventory & Emissions Statements New Source Review/Emission Offsets (NSR)

6. Designations Multi-factor analysis Air quality data Emissions data Population density and degree of urbanization Traffic and commuting patterns Growth rates and patterns Level of control of emissions sources Geography/Topography Meteorology Jurisdictional boundaries

7. Review of the Ozone NAAQS Section 109(d) - review of NAAQS every 5 years Planning Final review plan published 4/2011 Integrated Science Assessment (ISA) 2 nd External Review Draft published 9/2011 Risk Exposure/Assessment Policy Assessment drafts expected mid-2012/early 2013 Rulemaking To view documents from current review: http://www.epa.gov/ttn/naaqs/standards/ozone/s_o3_index.html