POLLUTION LOCATOR|Smog and Particulates | County Report

Criteria Air Pollutant Report: WORCESTER County, MA
  • Map Locating the Pollution Sources

    WORCESTER 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:
    Ozone 1-hour average concentration:
    Ozone 8-hour average concentration:
    PM-2.5 24-hour average concentration:
    PM-10 24-hour average concentration:
    Person-days in exceedance of national air quality standard for ozone (8-hour):
    See how this county ranks on other criteria air pollution attributes tracked by Scorecard

    Rank counties in MASSACHUSETTS by criteria air pollutant health risks, exposures, or emissions.
    Rank facilities in WORCESTER County by criteria air pollutant emissions.
    Rank monitoring stations in WORCESTER County by criteria air pollutant exposures.

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  • Environmental Justice Analysis for WORCESTER County

    View Summary Environmental Justice Report (en español).

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  • Health Risks
  • Population Exposed to Unhealthy Levels of Criteria Air Pollutants:

    Pollutant Person-days
    in exceedance
    of NAAQS
        8-hour average 776,610

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  • Exposures to Criteria Air Pollutants
  • Nonattainment Status:
    This county is in the Boston-Lawrence-Worcester (E. MA), MA-NH nonattainment area for failing to meet the national ambient air quality standard for the following criteria air pollutants:
    1. Ozone
    Air Quality Index:
    Percentage of days with good air quality:71
    Percentage of days with moderate air quality:28
    Percentage of days with unhealthful air quality for sensitive populations:2
    Percentage of days with unhealthful air quality:0
    Maximum AQI level in 2003124
    Median AQI level in 200340
    90th Percentile AQI level in 200366
    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
    of NAAQS
    Carbon monoxide
        1-hour average 35 ppm3.8 ppm3.6 ppm 0 1
        8-hour average 9 ppm2.3 ppm1.7 ppm 0 1
    Nitrogen dioxide
        Annual arithmetic mean 0.053 ppm.01 ppm0 ppm 0 1
        1-hour average 0.12 ppm.1 ppm.09 ppm 0 1
        8-hour average 0.08 ppm.08 ppm.08 ppm 1 1
        24-hour average 65 ug/m350 ug/m343 ug/m3 0 3
        Annual arithmetic mean 15 ug/m310.8 ug/m310 ug/m3 0 3
        24-hour average 150 ug/m346 ug/m335 ug/m3 0 1
        Annual arithmetic mean 50 ug/m319 ug/m30 ug/m3 0 1
    Sulfur dioxide
        3-hour average 0.50 ppm.02 ppm.02 ppm 0 1
        24-hour average 0.14 ppm.02 ppm.02 ppm 0 1
        Annual arithmetic mean 0.03 ppm.004 ppm0 ppm 0 1
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  • 1999 Emissions Summary of Criteria Air Pollutants
  • (Expressed in tons of pollutant emitted)
    PM-2.5 PM-10 Sulfur
    Mobile Sources134,30325,2656,54833,8212,12412,998
    Area Sources21,8883,1403,8178,0065,75718,642
    Point Sources1,4723,7474586582,426831
    All sources157,66332,15210,82342,48510,30732,470
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  • Links

    Scorecard's report on
    Massachusetts Air Quality Regulations
    Massachusetts Department of Environmental Protection
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