Phoenix Air Quality in 2019
In 2019, Phoenix's air quality (Phoenix-Mesa-Scottsdale, AZ area) had a median daily AQI of 74 (Moderate) across 365 monitored days. 54 days (14.8%) reached Unhealthy for Sensitive Groups or worse, 37 were Good, and the year's peak AQI was 929 (Hazardous). Ground-level ozone set the daily AQI on 157 of those days. The cleanest month of 2019 was February (median AQI 52, 0 days above 100) and the worst was June (median 99, 15 days above 100, peak 929).
- Good: 10.1%
- Moderate: 75.1%
- Unhealthy for Sensitive Groups: 11.5%
- Unhealthy or worse: 3.3%
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How was Phoenix's air quality in 2019?
Moderate on a typical day: median AQI 74, with 54 days above AQI 100 out of 365 monitored — the 1st cleanest of 7 years on record for the area.
- ✓Peak AQI in 2019: 929 (Hazardous).
- ✓Ground-level ozone was the main pollutant on 157 days.
- ✓Cleanest month: February; worst: June.
Frequently asked questions
What was the average AQI in Phoenix in 2019?▾
EPA's Air Quality System puts Phoenix's (Phoenix-Mesa-Scottsdale, AZ) median daily AQI for 2019 at 74, which is Moderate. 54 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 929.
Which month had the worst air quality in Phoenix in 2019?▾
The cleanest month of 2019 was February (median AQI 52, 0 days above 100) and the worst was June (median 99, 15 days above 100, peak 929).
Was 2019 a good or bad year for Phoenix's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 1st cleanest by days above AQI 100 — the best year on record here. 2019's median of 74 is below the area's typical annual median of 79.
Phoenix month by month in 2019
Phoenix air quality month by month, 2019 (Phoenix-Mesa-Scottsdale, AZ, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 63 | 0 | 93 | PM2.5 |
| Februarycleanest | 28 | 52 | 0 | 84 | O3 |
| March | 31 | 61 | 0 | 93 | O3 |
| April | 30 | 82 | 2 | 208 | O3 |
| May | 31 | 76 | 3 | 127 | O3 |
| Juneworst | 30 | 99 | 15 | 929 | O3 |
| July | 31 | 93 | 10 | 147 | O3 |
| August | 31 | 90 | 10 | 244 | O3 |
| September | 30 | 73 | 6 | 151 | O3 |
| October | 31 | 77 | 3 | 113 | PM10 |
| November | 30 | 79 | 4 | 143 | PM10 |
| December | 31 | 66 | 1 | 133 | PM2.5 |
How 2019 compares
Among the 7 years EPA has published for the area (2019–2025), 2019 ranks 1st cleanest by days above AQI 100 — the best year on record here.
2019's median of 74 is below the area's typical annual median of 79.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Phoenix
The latest EPA AirNow observation puts Phoenix's AQI at 75 (PM10). The figures above are multi-year annual statistics, not today's reading.
View current Phoenix air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Phoenix-Mesa-Scottsdale, AZ), 2019–2025. Daily AQI per CBSA is the highest AQI reported by any monitor in the area that day; the defining parameter is the pollutant that set it. Month and season statistics pool every such day in the period across all years listed. Retrieved 2026-09-09.