Mat-Su - Butte - PM2.5


Butte image Photo Taken December 14, 2014
(24-Hr PM2.5 Average = 51.21 µg/m3)

The Butte area of the Matanuska-Susitna Borough has experienced elevated levels of fine particulate matter (PM2.5). Air quality monitoring data indicates that the area may exceed the PM2.5 National Ambient Air Quality Standard (NAAQS) of 35 micrograms/cubic meter. If the area continues to experience elevated levels of PM2.5, EPA may designate the area as a nonattainment area.

Information on this page can help residents understand the issue and learn what actions they can take to improve air quality.

98th Percentile PM2.5
24-hr Average Concentration, µg/m3
2014 2015 2016 Design Value Cannot Exceed*
38.1 37.9 29.2 35.1 35.4

*Compliance with the 24-hr PM2.5 National Ambient Air Quality Standard (NAAQS) is determined using three years of air monitoring data. The design value (DV) is an average of 98th percentile 24-hr average PM2.5 concentrations over three years. The 2014-2016 DV is 35.1 µg/m3. The NAAQS is currently 35 µg/m3, an area is considered to violate the standards if the DV is 35.5 µg/m3 or above.

Current Air Quality
  • Real-Time Air Quality Data
  • Air Quality Advisories
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    Air Quality Monitoring Data
  • Design Values
  • Butte PM2.5 Data
  • Palmer PM2.5 Data
  • Butte Monitoring Report (PDF)
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  • Burn Wise Alaska
  • Split, Stack, Store & Save (PDF 10.6M)
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    Complaint Form
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  • Map
  • Butte Monitoring Site Map (PDF)
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    Monitoring Plan
  • Air Monitoring Plan
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    Health and Safety
  • Harms of Woodsmoke
  • PM2.5 Health Effects
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    Other Links
  • Mat-Su Borough Air Quality Webpage
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    ANPMS Contacts

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    Of Interest

    Division of Air Quality