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Current
Air Quality

Current Air Quality

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Current Air Quality Index
How does the AQI work?
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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 computed from the air monitoring data using an algorithm to weight the most recent hours of data more heavily. The Current Air Quality AQI values are calculated differently depending on the pollutant, particulate matter (PM) or ozone.

For PM, current air quality is computed from the most recent 12 hours of PM monitoring data, but the algorithm weighs the most recent hours of data more heavily than an ordinary 12-hour average when pollution levels are changing. This is used in lieu of a 24-hour average PM concentration in the calculation of the AQI until an entire calendar day of hourly concentrations has been monitored.

For ozone, current air quality is computed from the most recent 8-hours of ozone monitoring data, but the algorithm weighs the most recent hours of data more heavily than an 8 hour average when pollutant levels are changing. This is used in lieu  of a forward rolling 8-hour average for the calculation of the AQI until an entire calendar day of data hourly data is available.

At the end of each day, the 24-hour data 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 8/10/17 
days in each category 

2016
days in each category

2015
days in each category 
 
 2014
days in each category

2013 
days in each category

0-50
Good/Green
Air quality is considered satisfactory, and
air pollution poses little or no risk. 
154 273 258 284 241
51-100
Moderate/Yellow

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.

59 93 90 80 121
101-150
Unhealthy for Sensitive Groups/Orange
Members of sensitive groups may experience health effects. The general public is not likely to be affected.  8 0 11 1 2
151-200
Unhealthy/Red
Everyone may begin to experience health effects; members of sensitive groups may experience more serious health effects.  1 0 5 1 1
201-300
Very Unhealthy
Health warnings of emergency conditions. The entire population is more likely to be affected.  0  0 0 0 0
301-500+
Hazardous
Health alert: 
everyone may experience more serious health effects.
 
0  0 0 0 0

 

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