Mesa Air Quality in 2019
In 2019, Mesa'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%
Extra Protection for Mesa Homes
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How was Mesa'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 Mesa in 2019?▾
EPA's Air Quality System puts Mesa'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 Mesa 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 Mesa'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.
Mesa month by month in 2019
Mesa 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 Mesa
The latest EPA AirNow observation puts Mesa's AQI at 57 (PM10). The figures above are multi-year annual statistics, not today's reading.
View current Mesa 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.