September 19, 2019 -- EPA released a Technical Support Document (TSD) that details updated 2028 regional haze modeling data and results, including domestic and international source contributions to National Parks, wildlife refuges, and wilderness areas (“Class I areas”). The goal of this modeling effort was to project 2028 visibility conditions and source sector contribution information, including international anthropogenic visibility impacts, for each mandatory Class I federal area. EPA conducted this visibility modeling to inform the regional haze state implementation plan (SIP) development process for the second implementation period under EPA’s Regional Haze Rule.
On October 15, 2019, EPA hosted a webinar giving an overview of the updated 2028 regional haze modeling results. The slides from the webinar are available below.
You may need a PDF reader to view some of the files on this page. See EPA’s About PDF page to learn more.- Updated EPA 2028 Regional Haze Modeling - Technical Support Document (PDF)(393 pp, 50 MB, September 19, 2019)
- Updated EPA 2028 Regional Haze Modeling Webinar Slides (PDF)(39 pp, 7 MB)