2019-08309: Determination of Attainment by the Attainment Date; 2006 24-Hour Fine Particulate Matter National Ambient Air Quality Standard; Pinal County, Arizona
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The Environmental Protection Agency (EPA) is proposing to determine that the West Central Pinal County nonattainment area attained the 2006 24-hour national ambient air quality standard (NAAQS) for particulate matter with a diameter of 2.5 micrometers or smaller (PM<INF>2.5</INF> or "fine particulate matter") by December 31, 2017, the statutory attainment date for the area. The proposal is based on the three-year average of annual 98th percentile 24-hour concentrations for the 2015-2017 period, using complete, quality-assured, and certified PM<INF>2.5</INF> monitoring data.
The agency’s own summary, as published.
What this changes
Amends 1 part of the Code of Federal Regulations — the standing rules this notice rewrites.
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