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Environmental Epidemiology Program

Utah Air and Your Health

Air Quality Index (AQI)-based guidance for public health

1. Use the drop-down list under "Current Conditions" to select your location. If your location is not listed, click here.
2. Find the current PM2.5 and/or ozone levels.
3. Each row in the "General AQI Information" table applies to a specific range of values for PM2.5 or ozone. Find the row where the range includes the current conditions value. If the PM2.5 and ozone values do not fall on the same row, use the value resulting in a higher AQI Index Value.
4. "Cautionary Statements" are overall statements about health effects for the current conditions. Additional information can be obtained by looking at the rows of the same color in the "AQI Info" and “Symptoms” tables (click on the table icons to open).

General AQI Information

Index Values
Range (ug/m3)
Health Categories Cautionary Statements
0 - 50 0.0 - 12 0.0 - 0.059 Good None
51 - 100 12.1 - 35.4 0.060 - 0.075 Moderate Unusually sensitive people should consider limiting prolonged outdoor exertion.
101 - 150 35.5 - 55.4 0.076 - 0.095 Unhealthy for Sensitive Groups Active children and adults and people with respiratory disease such as asthma should limit prolonged outdoor exertion.
151 - 200 55.5 - 150.4 0.096 - 0.115 Unhealthy Active children and adults and people with respiratory disease such as asthma should avoid prolonged outdoor exertion. Everyone else, especially children, should limit prolonged outdoor exertion.
201 - 300 150.5 - 250.4 0.116 - 0.374 Very Unhealthy Active children and adults, and people with respiratory disease, such as asthma, should avoid all outdoor exertion; everyone else especially children, should limit outdoor exertion.
301 - 500 Over 250.4 Over 0.374 Hazardous Everyone should avoid all outdoor exertion.

For further details on air quality and your health please click
on table icons below and match PM2.5 and ozone levels

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The AQI addresses the health effects resulting from exposure to ozone or particulate matter (PM) individually. Typically, when one of these air pollutants is high (for example, summertime ozone), the other (summertime PM) is low. There are occassions when both may be high (for example high summertime ozone and concurrent wildfire generated PM). During these kinds of conditions, the likelihood of experiencing symtoms may be higher than indicated by these charts.

The AQI was developed using available scientific knowledge on average adverse health effects after acute exposure among a population. Individuals may be more or less sensitive. Base your interpretation of the current air quality conditions on your personal experience and history of symptoms under past similar air quality conditions.

Here is tool for tracking your symptoms during the ozone season.

Find answers about pregnancy and air quality here.


Click Below For More Information





Updated August 19, 2014