Juneau - Particulate Matter


Photo by Glynn Cater

EPA designated the Mendenhall Valley area of Juneau, Alaska as a moderate non-attainment area for the National Ambient Air Quality Standard (NAAQS) for particulate matter with an aerodynamic diameter less than or equal to a nominal 10 micrometers (PM10), upon enactment of the federal Clean Air Act Amendments of 1990 (56 FR 56694, November 6, 1991). The non-attainment classification was based on violations of the 24-hour standard that occurred throughout the 1980s.

The EPA fully approved Alaska's moderate PM10 non-attainment area plan as a State Implementation Plan (SIP) revision for the Mendenhall Valley PM10 non-attainment area in 1994 (Federal Register: March 24, 1994).



There has been no measured violation of EPA's PM10 standard since 1994. As such, ADEC is producing a Limited Maintenance Plan (LMP) for the Mendenhall Valley area of Juneau. The LMP provides contingency plans should Juneau ever experience a PM10 problem in the future and allows for Juneau to be designated as attainment for PM10.

Juneau is also very close to exceeding the PM2.5 health based standard of 24-hour 35 micrograms per cubic meter. However, Juneau is not on the national list of "non-attainment areas" for PM2.5. See press release below, and related documents:

Attainment Plan (SIP)

EPA Approved PM10 Attainment Plan(13Aug93)
State Adopted, Pending EPA Approval

Quick Links

ANPMS Contacts

Air Pollution in Alaska


Of Interest

Division of Air Quality