Outdoor
Current values look suitable for ordinary outdoor activity for most people.
Why: Low AQI and low pollutant levels support this guidance.
San Antonio, Texas, United States
San Antonio air quality today
Current values look suitable for ordinary outdoor activity for most people.
Data: Hourly Open-Meteo model estimateThe latest update is older than expected, so this page is showing an estimate for the current hour.Detailed metrics and guidance use the latest available detailed data.
Practical guidance
Running
An easy outdoor run looks reasonable, though warm and very humid conditions may make harder efforts feel heavier.
Why: Current air quality looks good, but warm and very humid conditions can make harder efforts feel heavier.
Ventilation
Current values support brief ventilation.
Why: Low AQI and low pollutant levels support brief ventilation.
Air quality and outdoor metrics
US AQI
Air Quality Index
42
Good
PM2.5
Fine particulate matter
7.7µg/m³
Low
PM10
Coarse particulate matter
9.4µg/m³
Low
NO₂
Nitrogen dioxide
4µg/m³
Low
O₃
Ozone
84µg/m³
Moderate
UV index
Sun exposure level
5
Moderate
Temperature
Air temperature
22°C
Comfortable
Feels like
Apparent temperature
25°C
Warm
Wind
Wind speed
3km/h
Light
Humidity
Relative humidity
93%
Very humid
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Disclaimer
This information is a general estimate only and is not medical advice.
Location
San Antonio, United States
Coordinates: 29.4241, -98.4936 · America/Chicago
Interpret AQI for outdoor activity
Calculic's European AQI calculator assesses the value using your population group and planned activity intensity.
Interpret AQI in CalculicThis page's European AQI value, city and timestamp are passed to the calculator through the link.
What affects air quality in San Antonio
The City of San Antonio's official air-quality page identifies ground-level ozone as a Bexar County concern and explains that nitrogen oxides and volatile organic compounds react in sunlight to form ozone; it lists industrial facilities and electric utilities, motor-vehicle exhaust, gasoline vapors and chemical solvents among local precursor sources.
This is evergreen local ozone-formation and precursor-source context, not a source-ranking claim, a current regulatory classification, current conditions, or this site's current-data provenance.
Local monitoring and context
TCEQ's 2025 five-year assessment documents multiple active San Antonio-area monitoring sites supporting ozone, ozone-precursor and meteorological monitoring, with different parameter sets at individual sites.
This describes local network context; sites and parameter sets can change, individual monitors are not citywide, and TCEQ monitoring is not this site's current Open-Meteo/CAMS data provider.
City air quality FAQ
How should I read the AQI for San Antonio?
US AQI condenses air quality into one value. On this page, it helps you quickly judge whether conditions look good, moderate or more polluted than usual.
Is the air quality good for going outside?
Check the outdoor and running cards first. They combine AQI, particles, ozone, weather and other factors that can affect outdoor comfort.
Should I ventilate right now?
The ventilation card considers AQI and pollutants such as particles, nitrogen dioxide and ozone. If values are elevated, a shorter opening or a later moment may be better.
Why can air quality change during the day?
Weather, emissions, ozone formation, particles and air flow can shift local conditions, so the next hours can differ from the current reading.
Sources and methodology
Current data
This page uses US AQI.
Current and hourly air-quality values are CAMS-based model estimates, not measurements from a local monitoring station. They may not reflect street-level conditions.
- Displayed state
- This hour's model estimate
- Data time
- 31 Oct 2026, 12:00 pm
- Weather data
- Open-Meteo
- Air-quality model data
- Copernicus Atmosphere Monitoring Service (CAMS). Open-Meteo selects data suited to this location. Possible CAMS datasets: CAMS European air quality forecasts, ENSEMBLE data; CAMS global atmospheric composition forecasts.
- Licence
- CC BY 4.0
City Air Quality selects the active data package, combines weather and air-quality data, chooses the current or latest usable model value, and formats it for this page.
The latest update is older than expected, so this page is showing an estimate for the current hour.
Detailed metrics and guidance use the latest available detailed data.
Evergreen city statements
Each local statement is linked to a checked primary-authority source. A source check is editorial provenance and does not describe current-data freshness.
Local sources support the background claims below; they are not the source of the current data shown above unless explicitly stated otherwise.
Authoritative sources for local statements
Air Quality
City of San Antonio — San Antonio Metropolitan Health District
- Scope
- Bexar County
- Source checked
- 26 Aug 2026
The page identifies ground-level ozone as a Bexar County concern, explains formation from NOx and VOCs in sunlight, and names industrial facilities and electric utilities, motor-vehicle exhaust, gasoline vapors and chemical solvents as precursor sources.
Applicability: Official city health-department material supports local ozone formation and precursor-source context; its outdated nonattainment-classification copy is not used.
Based on this source: The City of San Antonio's official air-quality page identifies ground-level ozone as a Bexar County concern and explains that nitrogen oxides and volatile organic compounds react in sunlight to form ozone; it lists industrial facilities and electric utilities, motor-vehicle exhaust, gasoline vapors and chemical solvents among local precursor sources.
Texas 2025 Five-Year Ambient Air Monitoring Network Assessment
Texas Commission on Environmental Quality
- Scope
- San Antonio area
- Source checked
- 26 Aug 2026
Appendix D says active San Antonio-area sites support enhanced ozone, ozone-precursor and meteorological monitoring; its site map and monitor inventory show multiple sites and differing monitored parameters.
Applicability: Official five-year network assessment supports area monitoring context and parameter diversity, not current citywide conditions or this site's current-data provenance.
Based on this source: TCEQ's 2025 five-year assessment documents multiple active San Antonio-area monitoring sites supporting ozone, ozone-precursor and meteorological monitoring, with different parameter sets at individual sites.