You Care, I Care, We All Care About Clean Air
The United States government created a scale called the PSI (Pollution Standard Index) to measure how much pollution is in the air. This PSI is often used in weather reports. It is also known as the Air Quality Index. Many cities have also created Air Quality Management Districts (AQMD) that check air quality on a daily basis. The amount of unhealthy gases in the atmosphere is measured in percentages.
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