AQI: Good (0 - 50) AQI: Moderate (51 - 100) AQI: Unhealthy for Sensitive Groups (101 - 150) AQI: Unhealthy (151 - 200) AQI: Very Unhealthy (201 - 300) AQI: Hazardous(301 - 500) Action DayAction Day
Highest 5: U.S. Air Quality Summary | Canada Air Quality
About the Highest 5
Note: Values above 500 are considered Beyond the AQI. Follow recommendations for the Hazardous category. Additional information on reducing exposure to extremely high levels of particle pollution is available here.
Fires: Current Conditions
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Embassies & Consulates U.S. Embassies and Consulates
Data from air quality monitors at select U.S. embassies and consulates around the world


2/1/16: Now Available! Air Quality Guide for Particle Pollution (en Español) - Guía de la calidad del aire sobre la contaminación por partículas
Now Available! Air Quality Guide For Ozone (en Español) - Guía de calidad de aíre para el ozono