The Trump administration’s Environmental Protection Agency has been quite active in clarifying and reversing policies and guidance established by prior administrations. This initiative has resulted in the release of numerous EPA letters and memoranda with profound effect on Clean Air Act implementation. Time will tell whether these are of lasting effect. The critical factor will be whether state and local air quality authorities agree to implement the changes. If state and local authorities follow suit and institutionalize the Trump EPA policies, it be more difficult for future administrations to rehash the issues.
For for a brief overview of a selection of recent EPA letters and memoranda related to the Clean Air Act, click here.