A measure of how clean or polluted the air in a given region is on a particular day is the

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The air quality index (AQI) is a measure used by government agencies to report the level of air pollution in a certain area. It takes into account several pollutants, including ozone, particulate matter, and carbon monoxide, and assigns a score from 0-500, with higher numbers indicating more polluted air. The AQI is a useful tool for individuals to make informed decisions about outdoor activities, and for officials to determine when to issue air quality alerts or take other measures to reduce pollution levels.

A Measure of How Clean or Polluted the Air in a Given