Quality of Air Means Quality of Life

AIRNow Home

AirCompare Home
County Comparisons
State Summaries
Monthly Averages
Basic Information
Health Concerns Affect the Comparison
About the Data
Frequently Asked Questions
Contact Us
Privacy and Security Notice
AirCompare - How to Interpret the Results


Select a different state


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.
Begin Site Footer


AIRNow Home