Mesa Air Quality in February
Across 2019–2025, Mesa's February air quality had a median AQI of 64 (Moderate) over 198 monitored days in the Phoenix-Mesa-Scottsdale, AZ area. 15.2% of February days (30 of 198) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 37.4% of days. The cleanest February on record here was 2019 (median AQI 52, 0 days above 100) and the worst was 2020 (median 150, 27 days above 100, peak AQI 214).
- Good: 16.2%
- Moderate: 68.7%
- Unhealthy for Sensitive Groups: 8.1%
- Unhealthy or worse: 7.1%
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.
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How is the air in Mesa in February?
Moderate on a typical day: median AQI 64 across 2019–2025, with 15.2% of February days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓16.2% of February days were Good (AQI 0–50), 68.7% Moderate (51–100).
- ✓30 days of 198 reached AQI 101+; the February peak was 214.
- ✓Best February: 2019; worst February: 2020.
Frequently asked questions
What is the air quality like in Mesa in February?▾
Across 2019–2025, the median daily AQI in Mesa in February was 64 (Moderate). 16.2% of days were Good, 68.7% Moderate, and 15.2% reached Unhealthy for Sensitive Groups or worse, based on 198 monitored days in EPA's Air Quality System.
Is February a good time for outdoor exercise in Mesa?▾
A typical February day in Mesa is Moderate (median AQI 64): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 7 of February days (15.2%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Mesa's February air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 37.4% of February days in Mesa. The highest February AQI recorded in 2019–2025 was 214 (Very Unhealthy), in 2020.
Mesa February air quality, year by year
Mesa February air quality by year (Phoenix-Mesa-Scottsdale, AZ, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 28 | 52 | 0 | 84 | O3 |
| 2020worst | 29 | 150 | 27 | 214 | O3 |
| 2021 | 28 | 65 | 0 | 87 | PM2.5 |
| 2022 | 28 | 69 | 0 | 100 | PM10 |
| 2023 | 28 | 56 | 0 | 95 | PM2.5 |
| 2024 | 29 | 55 | 0 | 75 | PM2.5 |
| 2025 | 28 | 78 | 3 | 109 | PM10 |
What February air means in Mesa
A typical February day in Mesa is Moderate (median AQI 64): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 7 of February days (15.2%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
February's median AQI of 64 is below Mesa's whole-year median of 79, making it one of the area's cleaner periods. Nationally, the median February AQI across every EPA metro area (87,428 metro-days, 2019–2025) is 41, so Mesa runs above the national February norm; 15.2% of its February days topped AQI 100 versus 0.4% nationally (above average).
February is part of Mesa's winter season (December, January, February); the winter page pools all three months.
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 month 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.