Metro area air quality · 2025
San Antonio-New Braunfels, TX
Median AQI 52 (Moderate). 42.5% of monitored days rated Good across this metro's EPA monitoring network.
- 52
- Median AQI
- 42.5%
- Good-air days
- 1
- Unhealthy days
- 8%
- Cleaner than US metros
San Antonio-New Braunfels, TX posted a 2025 median AQI of 52 (Moderate) with 42.5% Good days
According to the U.S. EPA Air Quality System, the San Antonio-New Braunfels, TX CBSA recorded a median AQI of 52 across 365 monitored days in 2025, with 42.5% rated Good and 1 unhealthy or worse. This is an annual metro comparison, not a live advisory.
Data source EPA Air Quality System (AQS)
- Cleaner than US metros
- The San Antonio-New Braunfels, TX CBSA's 42.5% Good-day share places it cleaner than 8% of US metros in 2025.
- Closest median-AQI peer
- Augusta-Richmond County, GA-SC (46.0% Good, median AQI 52) is the closest nationwide median-AQI peer to San Antonio-New Braunfels, TX.
- 2020–2025 Good-day shift
- San Antonio-New Braunfels, TX's Good-day share moved +10.3 points from 2020 to 2025 (median AQI -3).
- Median AQI
- Median AQI: 52
Aggregated from EPA Air Quality System (2025), 365 monitored days. EPA AQS →
The verdict
The San Antonio-New Braunfels, TX metro runs moderate on the EPA scale, among the more polluted US metros, a median AQI of 52 with 42.5% of 365 monitored days in the Good band.
- 52
- median AQI · Moderate
- 42.5%
- days rated Good
- 8%
- cleaner than US metros
- 154
- worst single reading
1 day reached Unhealthy or worse across the metro's monitors in 2025.
Annual release change
What changed in the 2025 EPA annual release
- San Antonio-New Braunfels, TX metro's peak single-day AQI fell from 199 to 154 between the 2024 and 2025 EPA annual releases, a change of -45 points.
- San Antonio-New Braunfels, TX metro's Good-day share fell from 46.5% to 43.7% between the 2024 and 2025 EPA annual releases, a change of -2.9 percentage points.
- San Antonio-New Braunfels, TX metro's Unhealthy-category days fell from 2 to 1 between the 2024 and 2025 EPA annual releases, a change of -1 days.
Insights: San Antonio-New Braunfels, TX metro. Aggregated EPA AQS monitors across this Core-Based Statistical Area logged a median Air Quality Index of 52 over 365 measured days in 2025, which corresponds to a Moderate band and a Poor metro-wide health grade. The monitored-day split lands at 155 Good days (42%), 199 Moderate (55%), and 10 Unhealthy-for-Sensitive-Groups (3%). The 90th-percentile AQI finished at 80 while the highest single-day reading hit 154 (Unhealthy). Metro residents averaged roughly 12.7 clean-air days per 30-day window across the reporting year.
Across the 2020–2025 trend window, the share of monitored days rated Good shifted by +10.3 points and the median AQI moved -3 points, which classifies the multi-year trajectory as improving. The annual record contains 1 day at Unhealthy or worse. On that day, the EPA recommends that sensitive groups limit prolonged outdoor exertion. Metros with comparable AQI profiles include Augusta-Richmond County, GA-SC (46.0% good, AQI 52); Beaumont-Port Arthur, TX (41.4% good, AQI 52); Birmingham-Hoover, AL (43.0% good, AQI 52).
Air Quality Summary
Median AQI
52
Moderate
Good Days
42.5%
155 of 365 days
Max AQI
154
Unhealthy
Health Grade
Poor
90th pct: 80
AQI Day Breakdown (2025)
Distribution of 365 monitored days across EPA AQI categories.
Good
155
42%
Moderate
199
55%
USG
10
3%
Unhealthy
1
0%
Very Unhealthy
0
0%
Hazardous
0
0%
Health Impact Assessment
The San Antonio-New Braunfels, TX metro area's air quality is rated Poor based on 42.5% good air days. There were 1 unhealthy days in 2025 when outdoor activity should be limited.
Air quality is acceptable most days, but 10 days reached "Unhealthy for Sensitive Groups" and peak AQI reached 154. Sensitive groups should monitor real-time conditions at AirNow.gov.
How does the San Antonio-New Braunfels, TX metro compare?
How San Antonio-New Braunfels, TX compares
5-Year Air Quality Trend
Air quality is improving in the San Antonio-New Braunfels, TX metro. Highest Good-day share: 2024 (46.5%, 161 of 346 monitored days).
| Year | Good | Moderate | Unhealthy | Median AQI | Max AQI |
|---|---|---|---|---|---|
| 2020 | 119 | 237 | 1 | 55 | 160 |
| 2021 | 108 | 245 | 0 | 55 | 147 |
| 2022 | 111 | 241 | 0 | 55 | 214 |
| 2023 | 152 | 201 | 1 | 53 | 309 |
| 2024 | 161 | 183 | 2 | 53 | 199 |
| 2025 | 155 | 199 | 1 | 52 | 154 |
Metros with a similar median AQI
CBSA peers nationwide whose annual median AQI sits near San Antonio-New Braunfels, TX (52).
Augusta-Richmond County, GA-SC
Median AQI 52 · 46.0% Good-day share
Beaumont-Port Arthur, TX
Median AQI 52 · 41.4% Good-day share
Birmingham-Hoover, AL
Median AQI 52 · 43.0% Good-day share
Charlotte-Concord-Gastonia, NC-SC
Median AQI 52 · 46.0% Good-day share
El Dorado, AR
Median AQI 52 · 41.8% Good-day share
Grand Rapids-Wyoming, MI
Median AQI 52 · 41.9% Good-day share
Metros with similar unhealthy-day exposure
A second relationship type: metros whose unhealthy-or-worse day count is closest to San Antonio-New Braunfels, TX's 1 (independent of median AQI).
Ann Arbor, MI
1 unhealthy-or-worse days · median AQI 41
Bangor, ME
1 unhealthy-or-worse days · median AQI 33
Baraboo, WI
1 unhealthy-or-worse days · median AQI 35
Bartlesville, OK
1 unhealthy-or-worse days · median AQI 44
Beaver Dam, WI
1 unhealthy-or-worse days · median AQI 40
Bellingham, WA
1 unhealthy-or-worse days · median AQI 31
More Air Quality Data
Explore EPA air quality rankings and guides across U.S. metros and counties.
Cleanest Metro Areas
U.S. metros ranked by their share of Good air-quality days.
Worst Air Quality
Counties and metros with the most unhealthy air days.
All Metro Areas
Annual AQI by CBSA for every monitored U.S. metro area.
Best and Worst City Air
What drives urban air quality and how metro areas compare.
Air Quality Guides
Frequently Asked Questions
What is the air quality in the San Antonio-New Braunfels, TX metro area? ▼
How many unhealthy air days does San Antonio-New Braunfels, TX have? ▼
Is air quality in San Antonio-New Braunfels, TX getting better or worse? ▼
What does AQI 52 mean for health? ▼
What is the 90th percentile AQI for San Antonio-New Braunfels, TX? ▼
How does San Antonio-New Braunfels, TX compare to other metro areas? ▼
Data Sources
Primary Source: U.S. Environmental Protection Agency (EPA), Air Quality System (AQS), Annual AQI by CBSA dataset, 2020–2025. See our methodology for how AQI, median, and coverage figures are computed.
Read our methodology , how this data is sourced, computed, and verified.
Source: U.S. EPA Air Quality System (AQS) Annual AQI by CBSA summary files (metro-level) · 2020–2025
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Every figure on PlainAirData is rendered directly from EPA AQS air-quality monitoring data, no number is typed in by an editor. This page draws directly on EPA AQS air-quality monitoring data, no figure is typed in by an editor. See our editorial standards & corrections policy, the methodology behind these numbers, or report a data error.