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Regional Haze 2nd Planning Period in the WRAP Region - Part 1: General Overview

The Clean Air Act (CAA) tasks EPA with returning our national forests and parks (Class I areas) to natural visibility conditions. Visibility impairment is produced by sources and activities which emit fine particles and their precursors (such as SO2 and NOx). The EPA and states have already completed the 1st Planning Period Regional Haze regulations and are about to embark on the second.

Western state agencies, with the help of the Western Regional Air Partnership (WRAP), have begun work on this second phase which includes examining all sources regardless of type and potential impacts on visibility. Many states are looking to finalize the rule by mid-2020. This webinar series discusses how the 2nd Planning Period will impact sources including non-major sources. The presentation covers which sources may now be subject to Regional Haze, explains how photochemical models will be used differently than the CALPUFF model that was used in the 1st Planning Period, reviews source apportionment models such as PSAT/SCICHEM, and discusses timelines.

Topics include:

  • Overview of Regional Haze
  • History of Regional Haze 1st Planning Period
  • Second Planning Period of RH Regulations
    • Technical aspects
    • Timeline
  • How does this affect your facility?
    • Source screening
    • Emission controls
    • Air dispersion modeling


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