Travis County had 239 days with good air quality in 2015, according to the Environmental Protection Agency (EPA). The overall five year trend is better, and our target is to get back to the 249 good air quality days that we experienced from 2012 to 2014.
The EPA calculates the Air Quality Index by measuring ground level ozone, particle pollution, carbon monoxide and sulfer dioxide
Travis County had 10 days of air quality that were unhealthy for sensitive groups in 2015. Sensitive groups include people with lung diseases, children, older adults, and people who exercise or work outdoors.
The Austin MSA has good air quality, when compared to these select US cities. Only Portland has better air quality. Denver and Philadelphia have the fewest number of good air quality days among these cities.