Frequently Asked Questions

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Revocation of the 1997 Primary Annual Particulate Matter (PM2.5) National Ambient Air Quality Standard (NAAQS) and Implementation of the 2012 PM2.5 NAAQS - (April 2017) FAQs to provide information on the transportation conformity and transportation planning implications as a result of implementation of the 2012 PM2.5 NAAQS and the revocation of the 1997 primary annual PM2.5 NAAQS.
Implementing the 2008 Ozone National Ambient Air Quality Standard (NAAQS): Frequently Asked Questions or (PDF - 128KB) - FAQs to address when conformity applies to the metropolitan transportation plan and TIP and at the project level; transitioning from the 1997 to 2008 8-hour ozone standard for areas nonattainment or maintenance for both; and how the planning process will be impacted by the transition to/from attainment.
Frequently Asked Questions on the Transportation Conformity Lapse Grace Period (HTML) or (PDF - 73Kb) - FAQs to clarify the implementation of the transportation conformity lapse grace period
Transportation and General Conformity Frequently Asked Questions (HTML) or (PDF - 40Kb) - FAQs regarding common questions and scenarios where the transportation and general conformity regulations may intersect for certain transportation projects and clarification on how the requirements can be met
PM2.5 Project-Level Conformity and Hot-Spot Analyses - FAQs about PM2.5 project-level conformity and hot-spot analyses