Summary

EPA is taking final action 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_2.5 or “fine particulate matter”) by December 31, 2017, the statutory attainment date for the area. This final action 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_2.5 monitoring data.

Action

Final rule.

Dates

This rule is effective on November 4, 2019.

Addresses

EPA has established a docket for this action under Docket ID No. EPA-R09-OAR-2019-0068. All documents in the docket are listed on the www.regulations.gov website. Although listed in the index, some information is not publicly available, e.g., Confidential Business Information (CBI) or other information whose disclosure is restricted by statute. Certain other material, such as copyrighted material, is not placed on the internet and will be publicly available only in hard copy form. Publicly available docket materials are available through www.regulations.gov, or please contact the person identified in the FOR FURTHER INFORMATION CONTACT section for additional availability information.

For Further Information Contact

Jerry Wamsley (wamsley.jerry@epa.gov), EPA Region IX, (415) 947-4111