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Bethel PM2.5 Data

Bethel Air Quality Monitoring Data - PM2.5

The interactive charts below show historical data from PM2.5 monitoring at the Bethel air quality monitoring site.  Sampling began on May 31st, 2018. The Alaska Air Monitoring Plan contains more information about this site.

Note: The vertical axis of these charts extend from -10 µg/m3 to 100 µg/m3. Negative PM2.5 concentrations are included based on EPA reporting guidelines and are within the noise levels of the instrument when the ambient PM2.5 concentration is near zero.

The following graphs show the 24-hour averaged PM2.5 concentrations measured at the Bethel Air Quality Monitoring Site from 2019 through 2018.


The 2019 PM2.5 24-hour concentrations were below the 24-hour NAAQS of 35 µg/m3 except for two days due to summertime wildfire smoke pollution. To date, DEC has not filed an Exceptional Events Waiver Request to EPA because the summertime wildfire concentrations are not yet regulatory significant. The 98th percentile concentration was 8.5 µg/m3.


The 2018 PM2.5 24-hour concentrations were all below the 24-hour NAAQS of 35 µg/m3. No data were flagged as exceptional events this year. The 98th percentile concentration was 9.9 µg/m3.

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