Air Quality Rankings for District Of Columbia 2026
District Of Columbia has 1 cities with EPA air quality data. District of Columbia, District Of Columbia has the cleanest air with a 5-year average AQI of 49.
| # | City | 5yr Avg AQI | Current AQI | Worst Pollutant | Trend | Grade |
|---|---|---|---|---|---|---|
| 1 | District of Columbia, District Of Columbia | 49 | 50 | PM2.5 | Improving | C |
Air quality data for District Of Columbia is sourced from the EPA Air Quality System (AQS), which monitors outdoor air quality at thousands of stations nationwide.
Frequently Asked Questions
District of Columbia, District Of Columbia has the best air quality in District Of Columbia with a 5-year average AQI of 49 and a grade of C.
District Of Columbia has 1 cities with EPA air quality monitoring data in our database, covering multiple years of AQI measurements.
The Air Quality Index (AQI) measures five major pollutants: ground-level ozone, particulate matter (PM2.5 and PM10), carbon monoxide, sulfur dioxide, and nitrogen dioxide. Lower AQI values indicate cleaner air — 0-50 is "Good," while 150+ is "Unhealthy."
Cities ranked by 5-year average AQI (lower is better). Grades factor in average AQI, trend direction, unhealthy days, and dominant pollutant.