federal_register: 2011-18582
Data license: Public Domain (U.S. Government data) · Data source: Federal Register API & Regulations.gov API
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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 |
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| 2011-18582 | Secondary National Ambient Air Quality Standards for Oxides of Nitrogen and Sulfur | Proposed Rule | This proposed rule is being issued as required by a consent decree governing the schedule for completion of this review of the air quality criteria and the secondary national ambient air quality standards (NAAQS) for oxides of nitrogen and oxides of sulfur. Based on its review, EPA proposes to retain the current nitrogen dioxide (NO<INF>2</INF>) and sulfur dioxide (SO<INF>2</INF>) secondary standards to provide requisite protection for the direct effects on vegetation resulting from exposure to gaseous oxides of nitrogen and sulfur in the ambient air. Additionally, with regard to protection from the deposition of oxides of nitrogen and sulfur to sensitive aquatic and terrestrial ecosystems, including acidification and nutrient enrichment effects, EPA is proposing to add secondary standards identical to the NO<INF>2</INF> and SO<INF>2</INF> primary 1-hour standards and not set a new multi-pollutant secondary standard in this review. The proposed 1-hour secondary NO<INF>2</INF> standard would be set at a level of 100 ppb and the proposed 1-hour secondary SO<INF>2</INF> standard would be set at 75 ppb. In addition, EPA has decided to undertake a field pilot program to gather and analyze additional relevant data so as to enhance the Agency's understanding of the degree of protectiveness that a new multi-pollutant approach, defined in terms of an aquatic acidification index (AAI), would afford and to support development of an appropriate monitoring network for such a standard. The EPA solicits comment on the framework of such a standard and on the design of the field pilot program. The EPA will sign a notice of final rulemaking for this review no later than March 20, 2012. | 2011-08-01 | 2011 | 8 | https://www.federalregister.gov/documents/2011/08/01/2011-18582/secondary-national-ambient-air-quality-standards-for-oxides-of-nitrogen-and-sulfur | https://www.govinfo.gov/content/pkg/FR-2011-08-01/pdf/2011-18582.pdf | Environmental Protection Agency | 145 | This proposed rule is being issued as required by a consent decree governing the schedule for completion of this review of the air quality criteria and the secondary national ambient air quality standards (NAAQS) for oxides of nitrogen and oxides of... |