Monitoring Network

The Agency maintains a monitoring network that uses state-of-the-art instruments dedicated to collecting high-quality air quality data. This data determines the compliance status of Southwest Ohio with the National Ambient Air Quality Standards (NAAQS) established by the U.S. EPA. Southwest Ohio is currently in compliance with five of the six NAAQS pollutants.

View the current Local Air Quality Map.

County Monitoring

To determine the air quality in Southwest Ohio, the Agency maintains monitors in five counties; Butler, Clermont, Clinton, Hamilton, and Warren. There are two types of monitors:

• Continuous monitors: operate constantly and measure ozone, sulfur dioxide, carbon monoxide, oxides of nitrogen and inhalable particulates. The Agency operations 14 continuous monitors in Southwest Ohio.
• Intermittent monitors: collect airborne particles at 24-hour intervals from nine locations in the area. Air toxics monitoring data is also collected from intermittent monitors at four locations.