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Division of Air Quality Monitoring and Quality Assurance

Air Quality Monitoring Data

Realtime Air Quality Data

Bethel Particulate Matter 10 (PM10)

The interactive charts below show historical data from PM10 monitoring at the Bethel air quality monitoring site.  Sampling began on June 6th, 2018 and ended in June 2020.  The Alaska Air Monitoring Plan contains more information about this site.

Note: The vertical axis of these charts extends to 200 µg/m3 . The PM10 concentrations are made at standard conditions and are corrected for local temperature and pressure.

Created with Highcharts 4.0.42006 24-hr NAAQS (150 ug/m3)First MaximumSecond MaximumNAAQS201820190102030405060708090100110120130140150160170180190200Alaska Department of Environmental Conservation | Division of Air Quality | https://dec.alaska.gov/air/
PM10 24-hr Maxium ValuesBethel, AK
PM10 24-hr Concentration (µg/m3)

The following graphs show the 24-hour averaged PM10 concentrations measured at the Bethel monitoring site from 2019 through 2018.

2019

Created with Highcharts 4.0.424-hr NAAQS (150 µg/m3)Bethel Air Quality MonitorBethel DataBethel ExceedancesBethel Exceptional EventsBethel First MaxBethel Second MaxJan '19Feb '19Mar '19Apr '19May '19Jun '19Jul '19Aug '19Sep '19Oct '19Nov '19Dec '190102030405060708090100110120130140150160170180190200Alaska Department of Environmental Conservation | Division of Air Quality | https://dec.alaska.gov/air/
2019 PM10 24-hr Average Concentrations - Bethel, AK
PM10 24-hr Concentration (µg/m3)

2018

Created with Highcharts 4.0.424-hr NAAQS (150 µg/m3)Bethel Air Quality MonitorBethel DataBethel ExceedancesBethel Exceptional EventsBethel First MaxBethel Second MaxJan '18Feb '18Mar '18Apr '18May '18Jun '18Jul '18Aug '18Sep '18Oct '18Nov '18Dec '180102030405060708090100110120130140150160170180190200Alaska Department of Environmental Conservation | Division of Air Quality | https://dec.alaska.gov/air/
2018 PM10 24-hr Average Concentrations - Bethel, AK
PM10 24-hr Concentration (µg/m3)
Glossary

Glossary

NAAQS
National Ambient Air Quality Standard - A health-based air quality standard set by EPA based on a review of available scientific information. NAAQS exist for criteria pollutants including Particulate Matter (PM2.5 and PM10), Carbon Monoxide (CO), Sulfur Dioxide (SO2), Nitrogen Dioxide (NO2), Ozone(O3), and Lead(Pb).
EPA's NAAQS Webpage
Concentration, µg/m3
The amount of PM2.5 suspended in the air with units of micrograms(one-millionth of a gram) per cubic meter
Exceedance
A day when the 24-hour measured concentration of PM2.5 exceeds the NAAQS.
98th Percentile
The daily value out of a year of PM2.5 monitoring data below which 98 percent of all daily values fall. 40 CFR 50 Appendix N - see section 4.5(a) (PDF)
24-hour Design Value (DV)
A three-year average of the 98th percentile value. An area is in violation of the NAAQS when the Design Values is greater than the 24-hour NAAQS for PM2.5, which is currently set at 35 µg/m340 CFR 50 Appendix N - see section 4.5(b) (PDF)
Clean Data Year
A year when the 98th percentile value is less than the NAAQS.
Exceptional Events
Unusual or naturally occurring events that can affect air quality but are not reasonably controllable.
EPA's Exceptional Events Webpage
DEC's Exceptional Events Webpage
Compliance with PM2.5 NAAQS
24-Hour: 98th percentile, averaged over 3 years, must be below the standardAnnual: Annual arithmetic mean, averaged over 3 years, must be below the standard. 40 CFR 50 Appendix N - see sections 4.1 and 4.2 (PDF)
PM2.5 NAAQS Values
Standard 1997 - 2006 2006 - 2012 2012 - 2024 2024 - current
24-hour 65 µg/m3 35 µg/m3 35 µg/m3 35 µg/m3
Annual 15 µg/m3 15 µg/m3 12 µg/m3 9 µg/m3

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Department of Environmental Conservation

Mailing Address:  P.O. Box 111800
Juneau, Alaska 99811
Location:  410 Willoughby Avenue, Juneau