Most Polluted City in North Carolina: Asheville (2021 Data)

Per the American Lung Association's 2021 "State of the Air" report, Asheville had the highest annual average PM2.5 (fine particulate) concentration in North Carolina: 11.3 µg/m³—above the national standard of 12 µg/m³ (since tightened to 9 µg/m³ in 2024).

Contributors: topography (mountain valleys trap inversions), wood smoke, vehicle emissions, regional transport. Other NC metros (Charlotte, Raleigh, Greensboro) ranked lower but still face ozone and particle challenges.

Check current AQI at AirNow.gov before outdoor activity.