Mesa Air Quality in 2024
In 2024, Mesa's air quality (Phoenix-Mesa-Scottsdale, AZ area) had a median daily AQI of 86 (Moderate) across 366 monitored days. 114 days (31.1%) reached Unhealthy for Sensitive Groups or worse, 25 were Good, and the year's peak AQI was 337 (Hazardous). Ground-level ozone set the daily AQI on 158 of those days. The cleanest month of 2024 was February (median AQI 55, 0 days above 100) and the worst was July (median 108, 22 days above 100, peak 337).
- Good: 6.8%
- Moderate: 62.0%
- Unhealthy for Sensitive Groups: 27.9%
- Unhealthy or worse: 3.3%
Reduce Indoor Ozone in Mesa
Today's main pollutant in Mesa is ground-level ozone (AQI 37). Important: standard HEPA filters do NOT remove ozone — only a purifier with a substantial activated-carbon bed adsorbs it. The biggest wins are cutting indoor sources (gas appliances, certain "ionizer" purifiers) and ventilating when outdoor ozone is low (early morning). A high-carbon unit helps with the gases and VOCs that linger indoors.
Recommended: Levoit Core 300 — True HEPA + activated carbon · CADR ~141 CFM · rooms up to 219 sq ft
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How was Mesa's air quality in 2024?
Moderate on a typical day: median AQI 86, with 114 days above AQI 100 out of 366 monitored — the 5th cleanest of 7 years on record for the area.
- ✓Peak AQI in 2024: 337 (Hazardous).
- ✓Ground-level ozone was the main pollutant on 158 days.
- ✓Cleanest month: February; worst: July.
Frequently asked questions
What was the average AQI in Mesa in 2024?▾
EPA's Air Quality System puts Mesa's (Phoenix-Mesa-Scottsdale, AZ) median daily AQI for 2024 at 86, which is Moderate. 114 days were Unhealthy for Sensitive Groups or worse and the year's highest AQI was 337.
Which month had the worst air quality in Mesa in 2024?▾
The cleanest month of 2024 was February (median AQI 55, 0 days above 100) and the worst was July (median 108, 22 days above 100, peak 337).
Was 2024 a good or bad year for Mesa's air?▾
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 5th cleanest by days above AQI 100. 2024's median of 86 is above the area's typical annual median of 79.
Mesa month by month in 2024
Mesa air quality month by month, 2024 (Phoenix-Mesa-Scottsdale, AZ, EPA AQS daily AQI)
| Month | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| January | 31 | 69 | 2 | 261 | PM2.5 |
| Februarycleanest | 29 | 55 | 0 | 75 | PM2.5 |
| March | 31 | 52 | 1 | 105 | O3 |
| April | 30 | 76 | 2 | 112 | O3 |
| May | 31 | 93 | 13 | 126 | O3 |
| June | 30 | 98 | 14 | 289 | O3 |
| Julyworst | 31 | 108 | 22 | 337 | O3 |
| August | 31 | 87 | 11 | 150 | O3 |
| September | 30 | 90 | 13 | 152 | PM10 |
| October | 31 | 104 | 16 | 141 | PM10 |
| November | 30 | 85 | 6 | 166 | PM10 |
| December | 31 | 99 | 14 | 162 | PM10 |
How 2024 compares
Among the 7 years EPA has published for the area (2019–2025), 2024 ranks 5th cleanest by days above AQI 100.
2024's median of 86 is above 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 37 (O3). 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.