Clean Air Act Operating Permit Program Revisions; California; Amador County Air Pollution Control District, Calaveras County Air Pollution Control District, Great Basin Unified Air Pollution Control District, Northern Sierra Air Quality Management District

The Environmental Protection Agency is proposing to approve revisions to five state of California air districts’ title V program rules to remove emergency affirmative defense provisions. The five districts are Amador County Air Pollution Control District (ACAPCD), Colusa County Air Pollution Control District (CCAPCD), Northern Sierra Air Quality Management District (NSAQMD), Shasta County Air Quality Management District (SCAQMD), and Tehama County Air Pollution Control District (TCAPCD). This action is being taken in accordance with federal regulations and the Clean Air Act. We are taking comments on these proposed revisions and will simultaneously publish a final action approving these revisions in a direct final rule.