How does the air quality in my city compare with other cities? What time of year has the best air quality? Has the air quality in my city improved? AirCompare provides local air quality information to help you make informed, health-protective decisions about moving or vacationing.

County Comparisons (Compare the air quality of counties within one or more states)

Summarize States (Choose up to 3 states)

Monthly Averages (Find the best time to visit)

Where is the best place in the United States to live to avoid air pollution? The best place to live may depend on whether you or your family have specific health concerns. People at greater risk from ground-level ozone are people with lung diseases, such as asthma, and children and adults who are active outdoors. At greatest risk from particle pollution are people with heart or lung disease, older adults (possibly because they may have undiagnosed heart or lung disease), and children. Learn more about how specific health concerns can affect the comparison. The links above provide health-specific air quality information in terms of the number of unhealthy days based on the Air Quality Index.