Ammonium sulfate plants

April 2012
- Thursday 19
  - Change of Address for Region 4, State and Local Agencies; Technical Correction
August 2011
- Thursday 11
  - Change of Address for Region 1; Technical Correction
March 2009
- Monday 09
  - New Source Performance Standards; Supplemental Delegation of Authority to the State of Wyoming
February 2004
- Friday 13
  - Delegation of Authority to the Washington State Department of Ecology, Benton Clean Air Authority, Northwest Air Pollution Authority, Olympic Regional Clean Air Agency, Puget Sound Clean Air Agency, Spokane County Air Pollution Control Authority, Southwest Clean Air Agency, and Yakima Regional Clean Air Authority for New Source Performance Standards
  - Delegation of Authority to the Oregon Department of Environmental Quality for New Source Performance Standards
March 2001
- Tuesday 06
  - Standards of Performance for New Stationary Sources; Supplemental Delegation of Authority to the State of Colorado
July 2000
- Monday 10
  - NESHAPS: Final Standards for Hazardous Air Pollutants for Hazardous Waste Combustors

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