POLLUTION LOCATOR|Smog and Particulates | County Report

Criteria Air Pollutant Report: SNOHOMISH County, WA
 
 
  • Map Locating the Pollution Sources

    SNOHOMISH County
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  • Air Quality Rankings: Health Risks, Exposure, and Emissions
    Cleanest/Best Counties in US Percentile Dirtiest/Worst Counties in US
    0% 10% 20% 30% 40% 50% 60% 70% 80% 90% 100%

    Carbon Monoxide emissions:
    Nitrogen Oxides emissions:
    PM-2.5 emissions:
    PM-10 emissions:
    Sulfur Dioxide emissions:
    Volatile Organic Compound emissions:
    Air Quality Index:
    PM-2.5 24-hour average concentration:
    See how this county ranks on other criteria air pollution attributes tracked by Scorecard

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    Rank facilities in SNOHOMISH County by criteria air pollutant emissions.
    Rank monitoring stations in SNOHOMISH County by criteria air pollutant exposures.

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  • Environmental Justice Analysis for SNOHOMISH County

    View Summary Environmental Justice Report (en español).

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  • Exposures to Criteria Air Pollutants
  • Air Quality Index:
    Percentage of days with good air quality:77
    Percentage of days with moderate air quality:21
    Percentage of days with unhealthful air quality for sensitive populations:2
    Percentage of days with unhealthful air quality:0
    Maximum AQI level in 2003114
    Median AQI level in 200331
    90th Percentile AQI level in 200372
    Air Quality Index
    0 - 50 Good
    50 - 100 Moderate
    100 - 200 Unhealthful
    200 - 300 Very Unhealthful
    300 - 500 Hazardous
    2003 Summary of Pollutant Concentrations:
    Pollutant NAAQS
    Standard
    Highest
    Recorded
    Concentration
    Second
    Highest
    Recorded
    Concentration
    Number
    of NAAQS
    Exceedances
    Stations
    Monitoring
    Pollutant
    Carbon monoxide
        1-hour average 35 ppm6 ppm5.9 ppm 0 2
        8-hour average 9 ppm4.5 ppm4 ppm 0 2
    PM-25
        24-hour average 65 ug/m342 ug/m341 ug/m3 0 2
        Annual arithmetic mean 15 ug/m310.7 ug/m39.1 ug/m3 0 2
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  • 1999 Emissions Summary of Criteria Air Pollutants
  • (Expressed in tons of pollutant emitted)
      Carbon
    monoxide
    Nitrogen
    oxides
    PM-2.5 PM-10 Sulfur
    dioxide
    Volatile
    organic
    compounds
    Mobile Sources140,33324,0693,02610,3182,35216,289
    Area Sources43,0341,9416,19111,40024312,935
    Point Sources9011,869891104931,276
    All sources184,26927,8789,30621,8273,08930,500
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  • Links

    Scorecard's report on
    Snohomish County Real-Time Air Monitoring
    Washington Department of Ecology
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