Bexar, Texas Air Quality
Bexar County, Texas (TX)
→ Stableover 10 years
How Bexar, Texas Air Quality Compares
Bexar, Texas's median AQI of 52is 27% worse than the national average of 41. Residents experience an average of 11 unhealthy air days per year, above the national threshold for concern. The primary pollutant of concern is Fine Particulate Matter (PM2.5).
Bexar, Texas Air Quality: The Full Picture
Bexar, Texas (Bexar County) holds an AirHistory Air Quality Grade of C (fair, scoring 51 out of 100), built from 10 years of EPA Air Quality System monitoring. Its median AQI fell 2 points between 2014 (54) and 2023 (52), and the five-year median now sits at 54 — inside the "Moderate" band on the EPA scale.
The pollutant driving most of the area's AQI readings is Fine Particulate Matter (PM2.5). In 2023, it set the daily AQI on 223 of 365 monitored days (61% of the year), making it the controlling pollutant for the C grade. The single worst reading logged that year hit an AQI of 309 (Hazardous), while the 90th-percentile day — the level the dirtiest 10% of days reach — came in at 79.
In 2023, Bexar County recorded 164 "Good" air days (45% of the 365 days with valid AQI data), 189 "Moderate" days, and 12 days at "Unhealthy for Sensitive Groups" or above. Over the most recent five years on record, monitors logged 53 days that crossed into "Unhealthy for Sensitive Groups" or worse — about 11 per year.
The decade-long trend is essentially flat, with year-to-year median AQI shifting by less than 0.28 points per year on average. The cleanest year in the record was 2016 (median AQI 49), and the most polluted was 2019 (median AQI 55). Because the data come straight from federally certified EPA monitors, these figures track the Texas county the monitors physically sit in rather than a city boundary.
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10-Year AQI Trend
The solid line shows the median AQI each year. The dashed line shows the 90th percentile (worst 10% of days).
Air Quality Day Breakdown
Number of days per year in each EPA AQI category. Green = Good (AQI 0-50), Yellow = Moderate (51-100), Orange = Unhealthy for Sensitive Groups (101-150), Red = Unhealthy or worse (151+).
Year-by-Year Data
| Year | Median AQI | 90th Pct | Max AQI | Good Days | Moderate | Unhealthy+ | Pollutant |
|---|---|---|---|---|---|---|---|
| 2023 | 52 | 79 | 309 | 164 | 189 | 12 | PM2.5 |
| 2022 | 55 | 80 | 214 | 116 | 236 | 13 | PM2.5 |
| 2021 | 55 | 80 | 147 | 113 | 240 | 12 | PM2.5 |
| 2020 | 55 | 80 | 160 | 119 | 237 | 10 | PM2.5 |
| 2019 | 55 | 74 | 175 | 117 | 242 | 6 | PM2.5 |
| 2018 | 49 | 71 | 166 | 187 | 167 | 11 | PM2.5 |
| 2017 | 50 | 70 | 203 | 186 | 171 | 6 | PM2.5 |
| 2016 | 49 | 67 | 164 | 199 | 161 | 6 | PM2.5 |
| 2015 | 53 | 78 | 156 | 139 | 212 | 14 | PM2.5 |
| 2014 | 54 | 77 | 136 | 129 | 230 | 6 | PM2.5 |
What This Means for Bexar County Residents
Bexar, Texas has received an Air Quality Grade of C (51/100) based on a decade of monitoring data from the EPA's air quality monitoring program. The current median AQI of 52 falls in the "Moderate" range.
The primary pollutant affecting this area is Fine Particulate Matter (PM2.5). Over the past 5 years, this area has averaged 11 unhealthy air quality days per year, days when sensitive groups (children, elderly, those with respiratory conditions) should limit outdoor activity. The American Lung Association's State of the Air report provides additional context on long-term health risks from air pollution exposure.
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Frequently Asked Questions
Bexar, Texas has a current median AQI of 52, which falls in the "Moderate" range. The area has received an Air Quality Grade of C (51/100) based on 10 years of EPA monitoring data.
Air quality in Bexar, Texas is stable over the past decade. The median AQI has changed by -2 points from 2014 to 2023.
Bexar, Texas averages 11 unhealthy air quality days per year over the past 5 years. On these days, sensitive groups including children, the elderly, and those with respiratory conditions should limit outdoor activity.
The primary pollutant affecting Bexar, Texas is Fine Particulate Matter (PM2.5). This is the dominant contributor to elevated AQI readings in the Bexar County area.
Bexar, Texas averages 11 unhealthy air days per year. Asthma patients should monitor daily AQI readings and limit outdoor activity when AQI exceeds 100. The primary pollutant is Fine Particulate Matter (PM2.5), which is a known asthma trigger.
With a median AQI of 52 (Moderate), outdoor exercise in Bexar, Texas is safe most days, though sensitive individuals should check daily AQI before intense workouts. Bexar, Texas averages 11 days per year when athletes should move workouts indoors.