Air pollution episode

air pollution episode

1. An extended period of a high concentration of pollutants in the atmosphere.

   
   
2. A public alert or notification of unhealthful air quality.

   
   

   In the U.S., the degree of alert is often based on the pollutant standards index (PSI):

   Stage 1 episode or alert, for 200 ≤ PSI < 275. Public recommendation: avoid strenuous activities. Children and elderly people advised to stay indoors.

   Stage 2 episode or alert, for 275 ≤ PSI < 400. Public recommendation: cease all physical activity, and stay indoors. Industry can be ordered to reduce emissions, and employees forced to carpool or use mass transportation for their necessary travel.

   Stage 3 episode or alert, for PSI ≥ 400. Everyone ordered to remain at home with windows closed. Minimize physical exertion and avoid driving vehicles. Automobile travel could be restricted and industries ordered to reduce emissions.

   
   

   
   

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1. An extended period of a high concentration of pollutants in the atmosphere.

Measure of the effective concentration of a chemical in the gas or liquid phase.