Juneau - Particulate Matter
(Photo by Glynn Cater)
Background
EPA designated the Mendenhall Valley area of Juneau, Alaska as a moderate nonattainment area for the National Ambient Air Quality Standard (NAAQS) for particulate matter with an aerodynamic diameter less than or equal to 10 micrometers (PM10) in 1991 based on violations of the 24-hour PM10 standard that occurred throughout the 1980s. The EPA fully approved Alaska's moderate PM10 nonattainment area plan as a State Implementation Plan (SIP) revision for the Mendenhall Valley PM10 nonattainment area in 1994 (Federal Register 59 FR 13884: March 24, 1994). On May 9, 2013, the EPA approved the first 10-year Limited Maintenance Plan (LMP) and concurrently re-designated the area to attainment for the PM10 NAAQS, effective July 8, 2013 (Federal register 78 FR 27071: May 9, 2013).
Under the provisions in the Clean Air Act (CAA) Section 175 A (United States Code (USC) Title 42 Section 7505(b)), States are required to submit a revision to the first 10-year LMP 8 years after the EPA approves the original re-designation. In the EPA LMP Option Guidance, States can prepare the required second 10-year maintenance plan if the area meets the qualification criteria. The second 10-year LMP explains how Mendenhall Valley currently meets and will continue to meet the 1987 NAAQS for PM10 through 2033. EPA approved the second 10-year LMP, effective November 25, 2021 (Federal Register 86 FR 58807: October 25, 2021).
Resources
Attainment Plan (SIP)
- EPA Approved PM10 Attainment Plan (PDF)
- EPA Approved Limited Maintenance Plan (PDF)
- EPA Approved Second Limited Maintenance Plan
- Adopted Juneau's Mendenhall Valley Second 10-Year Limited Maintenance Plan
- Adopted Juneau's Mendenhall Valley Second 10-Year Limited Maintenance Plan Appendix
Graphs
Memorandums
Projects By ADEC
Maps/Monitoring Plans
- PM10 Maintenance Area Boundary Map (PDF)
- Air Monitoring Plans
- Juneau Air Quality Monitoring Data - PM10
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