federal_register: E9-28058

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document_number title type abstract publication_date pub_year pub_month html_url pdf_url agency_names agency_ids excerpts regulation_id_numbers
E9-28058 Primary National Ambient Air Quality Standard for Sulfur Dioxide Proposed Rule Based on its review of the air quality criteria for oxides of sulfur and the primary national ambient air quality standard (NAAQS) for oxides of sulfur as measured by sulfur dioxide (SO<INF>2</INF>), EPA is proposing to revise the primary SO<INF>2</INF> NAAQS to provide requisite protection of public health with an adequate margin of safety. Specifically, EPA proposes to establish a new 1-hour SO<INF>2</INF> standard within the range of 50-100 parts per billion (ppb), based on the 3-year average of the annual 99th percentile (or 4th highest) of 1-hour daily maximum concentrations. The EPA also proposes to revoke both the existing 24-hour and annual primary SO<INF>2</INF> standards. 2009-12-08 2009 12 https://www.federalregister.gov/documents/2009/12/08/E9-28058/primary-national-ambient-air-quality-standard-for-sulfur-dioxide https://www.govinfo.gov/content/pkg/FR-2009-12-08/pdf/E9-28058.pdf Environmental Protection Agency 145 Based on its review of the air quality criteria for oxides of sulfur and the primary national ambient air quality standard (NAAQS) for oxides of sulfur as measured by sulfur dioxide (SO<INF>2</INF>), EPA is proposing to revise the primary...  

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