Austin Air Quality in April
Across 2019–2025, Austin's April air quality had a median AQI of 55 (Moderate) over 210 monitored days in the Austin-Round Rock, TX area. 0.5% of April days (1 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 61.9% of days. The cleanest April on record here was 2019 (median AQI 49, 0 days above 100) and the worst was 2025 (median 60, 1 day above 100, peak AQI 112).
- Good: 34.8%
- Moderate: 64.8%
- Unhealthy for Sensitive Groups: 0.5%
- Unhealthy or worse: 0.0%
Reduce Indoor Ozone in Austin
Today's main pollutant in Austin is ground-level ozone (AQI 33). 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 Austin in April?
Moderate on a typical day: median AQI 55 across 2019–2025, with 0.5% of April days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓34.8% of April days were Good (AQI 0–50), 64.8% Moderate (51–100).
- ✓1 day of 210 reached AQI 101+; the April peak was 112.
- ✓Best April: 2019; worst April: 2025.
Frequently asked questions
What is the air quality like in Austin in April?▾
Across 2019–2025, the median daily AQI in Austin in April was 55 (Moderate). 34.8% of days were Good, 64.8% Moderate, and 0.5% 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 Austin?▾
A typical April day in Austin is Moderate (median AQI 55): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of April days reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Austin's April air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 61.9% of April days in Austin. The highest April AQI recorded in 2019–2025 was 112 (Unhealthy for Sensitive Groups), in 2025.
Austin April air quality, year by year
Austin April air quality by year (Austin-Round Rock, TX, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019cleanest | 30 | 49 | 0 | 87 | O3 |
| 2020 | 30 | 54 | 0 | 74 | PM2.5 |
| 2021 | 30 | 54 | 0 | 88 | PM2.5 |
| 2022 | 30 | 55 | 0 | 80 | PM2.5 |
| 2023 | 30 | 51 | 0 | 79 | PM2.5 |
| 2024 | 30 | 62 | 0 | 98 | PM2.5 |
| 2025worst | 30 | 60 | 1 | 112 | PM2.5 |
What April air means in Austin
A typical April day in Austin is Moderate (median AQI 55): outdoor exercise is acceptable for most people, but unusually sensitive individuals should watch for symptoms, and fewer than 1% of April days 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 55 is in line with Austin's whole-year median of 52, so this period is neither a clean nor a dirty stretch for the area. Nationally, the median April AQI across every EPA metro area (100,677 metro-days, 2019–2025) is 44, so Austin runs above the national April norm; 0.5% of its April days topped AQI 100 versus 0.7% nationally (about the same).
April is part of Austin's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Austin
The latest EPA AirNow observation puts Austin's AQI at 33 (O3). The figures above are multi-year month statistics, not today's reading.
View current Austin air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Austin-Round Rock, TX), 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.