Quality of Air Means Quality of Life

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AirCompare - How to Interpret the Results

 

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The height of each bar equals the total number of unhealthy days (averaged over the last 5 years) for each month.  Three categories of unhealthy days from the Air Quality Index are possible in this graph:  orange days (unhealthy for sensitive groups), red days (unhealthy for everyone), and purple days (very unhealthy).  If a bar is made up of more than one color, you can see the proportion of orange days, red days, and/or purple days that add up to the total number of unhealthy days for each month. 

In general, a month with a shorter bar is a better time to travel than a month with a taller bar, though some people might also want to take into consideration how much red and/or purple a bar contains.

AIRNow is a government-backed program. Through AIRNow, EPA, NOAA, NPS, news media, tribal, state, and local agencies work together to report conditions for ozone and particle pollution. State, Local and Tribal Partners.
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