Scottsdale Air Quality in April
Across 2019–2025, Scottsdale's April air quality had a median AQI of 90 (Moderate) over 210 monitored days in the Phoenix-Mesa-Scottsdale, AZ area. 38.1% of April days (80 of 210) reached Unhealthy for Sensitive Groups or worse, and ground-level ozone set the daily AQI on 73.8% of days. The cleanest April on record here was 2024 (median AQI 76, 2 days above 100) and the worst was 2021 (median 214, 30 days above 100, peak AQI 236).
- Good: 2.4%
- Moderate: 59.5%
- Unhealthy for Sensitive Groups: 8.6%
- Unhealthy or worse: 29.5%
Reduce Indoor Ozone in Scottsdale
Today's main pollutant in Scottsdale is ground-level ozone (AQI 47). 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 is the air in Scottsdale in April?
Moderate on a typical day: median AQI 90 across 2019–2025, with 38.1% of April days above AQI 100. Ground-level ozone is the main driver.
- ✓2.4% of April days were Good (AQI 0–50), 59.5% Moderate (51–100).
- ✓80 days of 210 reached AQI 101+; the April peak was 763.
- ✓Best April: 2024; worst April: 2021.
Frequently asked questions
What is the air quality like in Scottsdale in April?▾
Across 2019–2025, the median daily AQI in Scottsdale in April was 90 (Moderate). 2.4% of days were Good, 59.5% Moderate, and 38.1% reached Unhealthy for Sensitive Groups or worse, based on 210 monitored days in EPA's Air Quality System.
Is April a good time for outdoor exercise in Scottsdale?▾
A typical April day in Scottsdale is Moderate (median AQI 90): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 3 of April days (38.1%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Scottsdale's April air quality problems?▾
Ground-level ozone set the daily AQI on 73.8% of April days in Scottsdale. The highest April AQI recorded in 2019–2025 was 763 (Hazardous), in 2021.
Scottsdale April air quality, year by year
Scottsdale April air quality by year (Phoenix-Mesa-Scottsdale, AZ, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019 | 30 | 82 | 2 | 208 | O3 |
| 2020 | 30 | 210 | 30 | 240 | O3 |
| 2021worst | 30 | 214 | 30 | 236 | O3 |
| 2022 | 30 | 76 | 7 | 135 | PM10 |
| 2023 | 30 | 87 | 3 | 123 | O3 |
| 2024cleanest | 30 | 76 | 2 | 112 | O3 |
| 2025 | 30 | 79 | 6 | 763 | O3 |
What April air means in Scottsdale
A typical April day in Scottsdale is Moderate (median AQI 90): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and about 1 day in 3 of April days (38.1%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
April's median AQI of 90 is above Scottsdale's whole-year median of 79, making it one of the area's dirtier periods. Nationally, the median April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so Scottsdale runs above the national April norm; 38.1% of its April days topped AQI 100 versus 0.7% nationally (above average).
April is part of Scottsdale's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Scottsdale
The latest EPA AirNow observation puts Scottsdale's AQI at 47 (O3). The figures above are multi-year month statistics, not today's reading.
View current Scottsdale 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.