Indicator · us-median-aqi
Median daily AQI
The middle day of the year; 0–50 is good, 51–100 moderate.
- Unit
- AQI
- Places
- 916 counties in 2025
- Built from
- Yearly air quality summary by county
- Reading it
- Lower is better.
Map and compare every county on visualizedata.org →
Median county, 1980–2025
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Show the data as a table
Highest and lowest in 2025
| Riverside County, CA | 80 AQI |
|---|---|
| San Bernardino County, CA | 77 AQI |
| Los Angeles County, CA | 74 AQI |
| Maricopa County, AZ | 73 AQI |
| El Paso County, TX | 70 AQI |
| Ponce Municipio, PR | 3 AQI |
|---|---|
| Caguas Municipio, PR | 5 AQI |
| Karnes County, TX | 6 AQI |
| Wilson County, TX | 8 AQI |
| Washakie County, WY | 8 AQI |
How it is computed
EPA median AQI, from the Yearly air quality summary by county dataset on this site. visualizedata.org computes the indicator for every place and year; the full table, the map and each place's history are on its page there. The underlying data, with its source and license, is on the dataset page, with the API and downloads.