Indicator · us-aqi-p90
90th-percentile daily AQI
The AQI that only the worst tenth of days exceeded.
- 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
| San Bernardino County, CA | 156 AQI |
|---|---|
| Riverside County, CA | 150 AQI |
| Los Angeles County, CA | 147 AQI |
| El Paso County, TX | 123 AQI |
| Doña Ana County, NM | 115 AQI |
| Karnes County, TX | 16 AQI |
|---|---|
| Sonoma County, CA | 17 AQI |
| Wilson County, TX | 19 AQI |
| Uinta County, WY | 19 AQI |
| Mayagüez Municipio, PR | 21 AQI |
How it is computed
EPA 90th percentile 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.