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  2. The higher the AQI value, the greater the level of air pollution and the greater the health concern. For example, an AQI value of 50 or below represents good air quality, while an AQI value over 300 represents hazardous air quality.

    www.airnow.gov/aqi/aqi-basics/
    Pollutants of major public health concern include particulate matter, carbon monoxide, ozone, nitrogen dioxide and sulfur dioxide. Outdoor and indoor air pollution cause respiratory and other diseases and are important sources of morbidity and mortality.
    www.who.int/health-topics/air-pollution
     
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    WEBAug 21, 2018 · If the air quality in your area is poor, stay inside as much as possible. If you absolutely need to go outside, wearing a face mask or nasal filter can help filter out particulate matter, Dr ...

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    WEBMar 25, 2015 · The main threats to local air quality across the United States (as well as most everywhere else) remain smog and particulate pollution, which combined or acting alone trigger millions of hospital visits and …

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