Houston Air Quality in 2025: Pollution Patterns
How air quality behaves in Houston: the latest measured AQI, which pollutants dominate, seasonal patterns, and the local drivers of pollution.
Current Air Quality
Air quality is satisfactory, and air pollution poses little or no risk.
Houston Air Quality in 2025
This page covers what shapes air quality in Houston over the course of a year: the pollutants that dominate locally, how conditions typically shift between seasons, and the local emission sources behind them. Measured 2025 annual statistics are published by EPA's Air Quality System, not here, so the AQI figure below is the latest observation available when this page was published.
View Current Houston Air Quality →Latest Measured Reading for Houston
The most recent EPA AirNow observation for the Houston-Galveston-Brazoria reporting area puts Houston's AQI at 37 (Good), with fine particulate matter (PM2.5) as the dominant pollutant — typical for the South Central region. Observed 5:00 AM CDT on August 9, 2026. Reported by Texas Commission on Environmental Quality.
This is a single observation captured when the page was published, not a 2025 average. For measured annual and monthly statistics, use the EPA's Air Quality System reports.
How Houston Air Quality Shifts Through the Year
Mar–May: Usually Houston's cleanest stretch. Mild temperatures and better atmospheric mixing keep both ozone and particulates down.
Jun–Aug: Heat and sunlight drive higher ozone and, in the West, wildfire-smoke episodes. Afternoons are typically the worst time to be outside.
Sep–Nov: Air quality generally improves as temperatures drop, though early fall can still carry wildfire smoke in the South Central region.
Dec–Feb: Cold-air temperature inversions can trap PM2.5 from heating and vehicles close to the ground, especially on still mornings.
Seasonal patterns above describe how pollution typically behaves in this region. They are not measured 2025 averages for Houston.
Is It Safe to Exercise Outside in Houston?
With Houston's AQI at 37 (Good), outdoor exercise is generally safe for most people. Conditions are good for running, cycling, and outdoor sports at any time of day.
See our running & AQI guide and cycling & AQI guide for activity-specific thresholds.
What's Causing Houston's Air Pollution?
In Houston, the leading pollutant is fine particulate matter (PM2.5). As part of the South Central region, the main drivers of air pollution here are:
- •Oil and gas production and processing
- •Vehicle emissions from rapidly expanding metros
- •Extreme heat that amplifies ground-level ozone
- •Power-plant emissions from fossil-fuel generation
Dig deeper: Houston PM2.5 levels · Houston ozone levels
Air Purifier & Monitor Buying Guides
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PM2.5 Levels
Fine particulate matter data →
Ozone Levels
Ground-level ozone data →
Seasonal Guides
Air quality by season →
Health Effects
Learn about air pollution impacts →
Frequently Asked Questions About Houston Air Quality
What is the current air quality in Houston?
The current Air Quality Index (AQI) in Houston, TX is 37, which is considered good.
Is it safe to exercise outdoors in Houston?
Yes, with an AQI of 37, outdoor exercise is safe for everyone in Houston.
When is the best time of year to visit Houston for good air quality?
Spring and early fall typically offer the best air quality in Houston. Summer months may have elevated ozone levels, while winter can see higher PM2.5 from temperature inversions.
What causes air pollution in Houston?
Air pollution in Houston can come from vehicle emissions, industrial activity, construction, wildfires, and weather patterns. Local geography and seasonal factors also play a significant role.
Explore More Air Quality Data
Improve Indoor Air Quality
Even with good outdoor air in Houston, indoor PM2.5, dust and allergens build up. A True-HEPA purifier keeps a bedroom or office consistently clean.
Compare top-rated True-HEPA purifiers:
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