"The AQI is an index for reporting daily air quality. It tells you how
clean or polluted your air is, and what associated health effects might
be a concern for you. The AQI focuses on health effects you may
experience within a few hours or days after breathing polluted air. EPA
calculates the AQI for five major air pollutants regulated by the Clean
Air Act: ground-level ozone, particle pollution (also known as
particulate matter), carbon monoxide, sulfur dioxide, and nitrogen
dioxide. For each of these pollutants, EPA has established national air
quality standards to protect public health ..."
Air Quality Index
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