Clean Air Progress Reports

For nearly 20 years, Maryland's air quality has improved. Maryland is in compliance with federal air quality standards for four of the six criteria pollutants: carbon monoxide, lead, nitrogen dioxide, and particulate matter. Maryland is continuing efforts to comply with the federal standards for ozone and sulfur dioxide.​​​​​

Clean air matters to Maryland, our neighboring states and the Chesapeake Bay, and that is why we are committed to a course of air quality improvements.