PM2.5 · main
81
Moderate
Baytown
Air Quality
Measured air quality for the Houston metro area, which includes Crosby. The U.S. Air Quality Index (AQI) runs 0–500; the number below is the highest of the reported pollutants, which sets the overall level.
81
Moderate
Main pollutant: PM2.5 · Baytown monitor · 2026-07-20 13:00 CDT
Measured by the closest reporting Texas Commission on Environmental Quality monitor for each pollutant (per AirNow) in the Houston-Galveston-Brazoria, TX area — the nearest official monitors to Crosby, which has none of its own (PM2.5 — Baytown; ozone — Baytown Garth; PM10 — Houston Deer Park). A real reading for the area, not a Crosby-pinpoint value.
PM10
53
Moderate
Houston Deer Park
ozone
40
Good
Baytown Garth
What this means
Acceptable for most. Unusually sensitive people may consider limiting prolonged outdoor exertion.
How to read the AQI
| AQI | Level | What to do |
|---|---|---|
| 0–50 | Good | Air is clean — enjoy outdoor activity. |
| 51–100 | Moderate | Unusually sensitive people: ease up on hard outdoor exertion. |
| 101–150 | Sensitive groups | Heart/lung conditions, kids, older adults: limit prolonged exertion. |
| 151–200 | Unhealthy | Everyone limits prolonged exertion; sensitive groups avoid it. |
| 201–300 | Very Unhealthy | Avoid outdoor exertion. |
| 301+ | Hazardous | Stay indoors; avoid all outdoor exertion. |
Air quality on the Gulf Coast
Ground-level ozone is the Houston area's signature summer pollutant — it forms on hot, sunny, stagnant afternoons when sunlight cooks emissions from traffic and the ship-channel industry, so ozone AQI usually peaks mid-afternoon and eases overnight. Fine particles (PM2.5) matter year-round and spike with wildfire smoke, Saharan dust in summer, and still winter mornings. When TCEQ calls an Ozone Action Day, sensitive groups should plan outdoor activity for the morning.
- AirNow (EPA) — the EPA's official measured air-quality data — the source behind this page
- TCEQ air monitoring — the Texas agency that runs the monitors
- Pollen & mold — the daily measured pollen and mold count for the Crosby area
- Crosby forecast — how heat and stagnant air drive ozone days