Ozone, carbon monoxide, sulfur dioxide, nitrogen dioxide, particulate matter less than 10 microns, particulate matter less than 2.5 microns, and lead are considered criteria pollutants because of their impact on human health and welfare.

Through planning, monitoring for National Ambient Air Quality Standards (NAAQS), and pollution control methods, DNREC continually works to improve the quality of the environment.

Recognizing public health, the environment, and the economy as key components in finding solutions to air pollution, DNREC has made significant progress in adopting effective and publicly-acceptable plans for emissions reductions at the lowest costs to the regulated community.

Find definitions of terms used in air quality stories.

DNREC is always looking for better ways to provide citizens with the most accurate and timely air quality data. This moveable monitoring platform can collect data in areas without permanent monitoring stations.