Visibility - Guidance Documents
EPA has provided guidance to states and tribes to assist in the implementation of the Regional Haze Rule. The guidance documents listed below are not regulations and do not change or substitute for any legal requirements in the Clean Air Act or Regional Haze Rule. This page contains a chronological listing of recent guidance documents related to visibility.
Technical Support Document for EPA’S Updated 2028 Regional Haze Modeling (September 19, 2019)
Guidance for Tracking Progress Under the Regional Haze Rule (September 2003) (Note: this document is relied upon by the 2018 Technical Guidance on Tracking Visibility Progress for the Second Implementation Period of the Regional Haze Program, listed above)