Air quality is measured by the Federal government with something called the ‘AIQ’ or Air Quality Index. Air quality measures the parts per millions or PPMs of many pollutants like CO2 and Methane gas as well as other conditions like smog to rate areas on a scale of 0 to 300 based on fifty. 0-50 scores are considered the cleanest while 250-300 are considered the most dangerous. US skies mostly score between 0 and 100, rarely breaking a score of 150.
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