Houston Air Quality in April
Across 2019–2025, Houston's April air quality had a median AQI of 64 (Moderate) over 210 monitored days in the Houston-The Woodlands-Sugar Land, TX area. 10.0% of April days (21 of 210) reached Unhealthy for Sensitive Groups or worse, and fine particulate matter (PM2.5) set the daily AQI on 51.0% of days. The cleanest April on record here was 2022 (median AQI 63, 1 day above 100) and the worst was 2019 (median 66, 5 days above 100, peak AQI 119).
- Good: 11.4%
- Moderate: 78.6%
- Unhealthy for Sensitive Groups: 9.5%
- Unhealthy or worse: 0.5%
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How is the air in Houston in April?
Moderate on a typical day: median AQI 64 across 2019–2025, with 10.0% of April days above AQI 100. Fine particulate matter (PM2.5) is the main driver.
- ✓11.4% of April days were Good (AQI 0–50), 78.6% Moderate (51–100).
- ✓21 days of 210 reached AQI 101+; the April peak was 159.
- ✓Best April: 2022; worst April: 2019.
Frequently asked questions
What is the air quality like in Houston in April?▾
Across 2019–2025, the median daily AQI in Houston in April was 64 (Moderate). 11.4% of days were Good, 78.6% Moderate, and 10.0% 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 Houston?▾
A typical April day in Houston 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 10 of April days (10.0%) reached AQI 101+ — the level at which EPA advises people with asthma, children and older adults to shorten hard outdoor exertion.
Which pollutant causes Houston's April air quality problems?▾
Fine particulate matter (PM2.5) set the daily AQI on 51.0% of April days in Houston. The highest April AQI recorded in 2019–2025 was 159 (Unhealthy), in 2019.
Houston April air quality, year by year
Houston April air quality by year (Houston-The Woodlands-Sugar Land, TX, EPA AQS daily AQI)
| Year | Days monitored | Median AQI | Days above 100 | Peak AQI | Main pollutant |
|---|---|---|---|---|---|
| 2019worst | 30 | 66 | 5 | 119 | O3 |
| 2020 | 30 | 67 | 2 | 105 | O3 |
| 2021 | 30 | 63 | 3 | 159 | PM2.5 |
| 2022cleanest | 30 | 63 | 1 | 147 | PM2.5 |
| 2023 | 30 | 64 | 1 | 105 | O3 |
| 2024 | 30 | 65 | 5 | 108 | O3 |
| 2025 | 30 | 63 | 4 | 133 | PM2.5 |
What April air means in Houston
A typical April day in Houston 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 10 of April days (10.0%) 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 64 is in line with Houston's whole-year median of 61, 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 Houston runs above the national April norm; 10.0% of its April days topped AQI 100 versus 0.7% nationally (above average).
April is part of Houston's spring season (March, April, May); the spring page pools all three months.
Activity-specific thresholds: running, cycling, kids' sports.
Right now in Houston
The latest EPA AirNow observation puts Houston's AQI at 47 (PM2.5). The figures above are multi-year month statistics, not today's reading.
View current Houston air quality →Source: EPA Air Quality System (AQS) pre-generated Daily AQI by CBSA files — daily AQI by CBSA (Houston-The Woodlands-Sugar Land, 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.