Air Quality Rankings for Arizona 2026
Arizona has 13 cities with EPA air quality data. Apache, Arizona has the cleanest air with a 5-year average AQI of 13. Maricopa, Arizona has the highest AQI at 90.
| # | City | 5yr Avg AQI | Current AQI | Worst Pollutant | Trend | Grade |
|---|---|---|---|---|---|---|
| 1 | Apache, Arizona | 13 | 13 | PM10 | Stable | A |
| 2 | Mohave, Arizona | 17 | 15 | PM10 | Stable | B |
| 3 | Santa Cruz, Arizona | 43 | 37 | PM2.5 | Worsening | C |
| 4 | Yavapai, Arizona | 43 | 43 | Ozone | Stable | B |
| 5 | Navajo, Arizona | 44 | 43 | Ozone | Stable | C |
| 6 | La Paz, Arizona | 45 | 45 | Ozone | Stable | C |
| 7 | Cochise, Arizona | 45 | 44 | Ozone | Stable | B |
| 8 | Coconino, Arizona | 45 | 46 | Ozone | Stable | C |
| 9 | Gila, Arizona | 46 | 46 | Ozone | Stable | C |
| 10 | Yuma, Arizona | 48 | 48 | Ozone | Stable | C |
| 11 | Pima, Arizona | 53 | 54 | Ozone | Worsening | C |
| 12 | Pinal, Arizona | 66 | 64 | PM10 | Improving | D |
| 13 | Maricopa, Arizona | 90 | 72 | Ozone | Worsening | F |
Air quality data for Arizona is sourced from the EPA Air Quality System (AQS), which monitors outdoor air quality at thousands of stations nationwide.
Frequently Asked Questions
Apache, Arizona has the best air quality in Arizona with a 5-year average AQI of 13 and a grade of A.
Arizona has 13 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.