AQI 52 · Ozone · Trend: Improving
| Average AQI | 52 |
| Good Days / Year | 200 |
| Unhealthy Days / Year | 12 |
| Primary Pollutant | Ozone |
| PM2.5 Average | 9.5 µg/m³ |
| Trend | ↓ Improving |
| Monitoring Stations | 32 |
| Nonattainment Areas | 1 |
Maryland's air quality is primarily influenced by the Baltimore industrial area and I-95 corridor vehicle traffic. The state is also downwind from Midwest coal plants. Chesapeake Bay and mountain areas have much cleaner air.
Maryland DE (Dept. of the Environment) Air and Radiation Administration manages standards. Vehicle emissions testing. Member of RGGI. Strong ozone transport regulations.
Baltimore metro — ozone and PM2.5 nonattainment. Maryland is affected by transported pollution from Midwest power plants.