The Environmental Protection Agency (EPA) is proposing to approve, as part of the State Implementation Plan (SIP) for the State of Arizona, the second 10-year maintenance plan for the Douglas maintenance area for the 1971 National Ambient Air Quality Standards (NAAQS or ``standards'') for sulfur dioxide (SO2 ).
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Air Plan Approval; Douglas, Arizona; Second 10-Year Sulfur Dioxide Maintenance Plan
The Environmental Protection Agency (EPA) is proposing to approve, as part of the State Implementation Plan (SIP) for the State of Arizona, the second 10-year maintenance plan f...
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83 FR 6996
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“Air Plan Approval; Douglas, Arizona; Second 10-Year Sulfur Dioxide Maintenance Plan,” thefederalregister.org (February 16, 2018), https://thefederalregister.org/documents/2018-03270/air-plan-approval-douglas-arizona-second-10-year-sulfur-dioxide-maintenance-plan.