Air Quality

The Air Quality Index is based on data collected from DEQ's air monitors. These raw measurements are then converted into AQI values. An AQI value is calculated for each individual pollutant using standard formulas. The highest of the AQI values for the individual pollutants becomes the AQI value for that day. For example, if AQI values are 90 for ozone and 88 for carbon monoxide, the AQI reported would be 90 for the pollutant ozone on that day.

View  Air Quality Index

For further information on the AQI and how it is calculated visit A Guide to Air Quality and Your Health on the AirNow Web site.

Additional Oregon AQI Resources

How does Oregon's air quality compare to the rest of the country? 

In 1980, only 30% of Oregonians lived in clean air areas that met national health standards for air pollution. Today, all areas in Oregon meet these standards. This success is the result of clean air strategies developed by DEQ with the participation of affected communities, businesses and citizens. At the same time, DEQ is addressing another group of pollutants, air toxics, that has emerged as a serious concern. Many areas of the state have air toxics that are above EPA health-based benchmarks. Air toxics have serious health effects such as cancer and nervous system damage, but there are currently no national health standards for these pollutants. DEQ currently is focusing on air toxic pollutants, including benzene and diesel particulate, that have emerged as a significant concern.