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Air Quality

Current Air Quality


Burn Restrictions

Burning Restrictions


Current Air Quality Index
How does the AQI work?
Burn Bans

Air Quality Index (AQI)

The AQI is a national standardized method for reporting daily air quality. It tells you how clean or polluted your air is, and what associated health effects might be a concern for you. The AQI converts the measured concentration of the dominant air pollutant to an AQI value using a scale of 0 to 500. 

The Current Air Quality reported here is a calculation of 24-hour data updated each hourl, with more recent hours given greater weight in the calculation. Using this "weighted calculation" better reflects real-time, hourly air quality so that individuals can adjust their activity levels. At the end of each day, the 24-hour data (midnight to midnight, unweighted) is calculated and is the official AQI for the day. This official daily AQI is displayed in the chart below.

Printable AQI charts:

The AQI chart below for the Spokane area is updated monthly. 

AQI Value
Category/Color Code
Cautionary Health Statements as of 5/31/17 
days in each category 

days in each category

days in each category 
days in each category

days in each category

Air quality is considered satisfactory, and
air pollution poses little or no risk. 
109 273 258 284 241

Air quality is acceptable; however, for certain pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive
to air pollution.

40 93 90 80 121
Unhealthy for Sensitive Groups/Orange
Members of sensitive groups may experience health effects. The general public is not likely to be affected.  2 0 11 1 2
Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.  0 0 5 1 1
Very Unhealthy
Health warnings of emergency conditions. The entire population is more likely to be affected.  0  0 0 0 0
Health alert: 
everyone may experience more serious health effects.
0  0 0 0 0


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