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‘Unhealthy’ Air-Quality Index Level

All About the “Unhealthy” Air-Quality Index Level

  • We classify conditions as moderate if

    • Short-term (one-hour) concentrations are 139–351 µg/m3
    • Eight-hour average concentrations are 80–200 µg/m3
    • 24-hour average concentrations are 56–150 µg/m3
  • The AQI range for unhealthy air quality is 151–200

  • The visibility during unhealthy air quality is usually 1.5–2.75 miles

  • Health effects expected

    • Increasing likelihood of respiratory or cardiac symptoms
    • Aggravation of heart or lung disease
  • Caution statements?

    • People with heart or lung disease, the elderly, children, and pregnant women should limit prolonged or heavy exertion
    • Limit time spent outdoors, physical exertion
    • Sensitive groups should avoid prolonged or heavy exertion
  • Protective actions?

    • Reduce exposure to particles by keeping doors and windows closed, seal large gaps as much as possible
    • Avoid using exhaust fans
    • Avoid indoor sources of pollutants, including tobacco smoke, heating with wood stoves and kerosene heaters, frying or broiling foods, burning candles, vacuuming, and using paints, solvents, cleaning products, and adhesives
Last modified on April 21st, 2017
Posted on April 21st, 2017