Based on the Environmental Protection Agency's (EPA's) review of the air quality criteria addressing human health effects and the primary national ambient air quality standard (NAAQS) for sulfur oxides (SOX ), the EPA is proposing to retain the current standard, without revision.
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Review of the Primary National Ambient Air Quality Standards for Sulfur Oxides
Based on the Environmental Protection Agency's (EPA's) review of the air quality criteria addressing human health effects and the primary national ambient air quality standard (...
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83 FR 26752
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“Review of the Primary National Ambient Air Quality Standards for Sulfur Oxides,” thefederalregister.org (June 8, 2018), https://thefederalregister.org/documents/2018-12061/review-of-the-primary-national-ambient-air-quality-standards-for-sulfur-oxides.