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. The color of the flag matches EPA's Air Quality Index (AQI): green, yellow, orange, red, and purple.
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epapennants

3 Feet (ft) Height x 5 Feet (ft) Length Pennant, Green Nylon Air Quality Index Flag
$43.28
epapennants

3 Feet (ft) Height x 5 Feet (ft) Length Pennant, Yellow Nylon Air Quality Index Flag
$43.28
epapennants

3 Feet (ft) Height x 5 Feet (ft) Length Pennant, Orange Nylon Air Quality Index Flag
$43.28
epapennants

3 Feet (ft) Height x 5 Feet (ft) Length Pennant, Red Nylon Air Quality Index Flag
$43.28
epapennants

3 Feet (ft) Height x 5 Feet (ft) Length Pennant, Purple Nylon Air Quality Index Flag
$43.28
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1