San Antonio: Air Pollution Today — AQI Index, PM2.5/PM10, Smog Alerts and Forecast

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Latest air quality data: San Antonio

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Pollution and air quality forecast for San Antonio. Today is Thursday, August 27, 2026. The following air pollution values have been recorded for San Antonio:

particulate matter (PM2.5) dust - 12 (Good)
particulate matter (PM10) suspended dust - 17 (Good)
ozone (O3) - 98 (Moderate)
nitrogen dioxide (NO2) - 10 (Good)
sulfur dioxide (SO2) - 1 (Good)
carbon monoxide (CO) - 111 (Good)

Real-time Air Quality Index (AQI) for San Antonio, Wednesday, August 26, 2026: 2.

AQI 2 Moderate

What is the air quality in San Antonio today? Is the air polluted in San Antonio?. Is there smog?

Today (Wednesday, August 26, 2026) air quality is moderate in San Antonio. Some pollutants in San Antonio may slightly affect very few hypersensitive individuals. Air pollutants in San Antonio may cause minor breathing discomfort to sensitive people.

What is the current level of PM2.5 in San Antonio? (particulate matter (PM2.5) dust)
Today's PM2.5 level is: 12 (Good) For comparison, the highest level of PM2.5 in San Antonio in the last 7 days was: 15 (Friday, August 21, 2026) and the lowest: 8 (Tuesday, August 25, 2026).

What is the level of PM10 today in San Antonio? (particulate matter (PM10) suspended dust)
The current level of particulate matter PM10 in San Antonio is: 17 (Good)

How is the O3 level today in San Antonio? (ozone (O3))
98 (Moderate)

How high is the level of NO2? (nitrogen dioxide (NO2))
10 (Good)

What is the level of SO2 pollution? (sulfur dioxide (SO2))
1 (Good)

How high is the CO level? (carbon monoxide (CO))
111 (Good)

Current data Wednesday, August 26, 2026 at 8:00 PM

PM2,5 12 (Good)

PM10 17 (Good)

O3 98 (Moderate)

NO2 10 (Good)

SO2 1 (Good)

CO 111 (Good)

Data on air pollution from recent days in San Antonio

index	2026-08-26	2026-08-25	2026-08-24	2026-08-23	2026-08-22	2026-08-21	2026-08-20	2026-08-19
pm25	10 Good	8 Good	8 Good	10 Good	14 Moderate	15 Moderate	11 Good	9 Good
pm10	14 Good	12 Good	10 Good	14 Good	21 Moderate	26 Moderate	15 Good	13 Good
o3	71 Moderate	60 Good	70 Moderate	76 Moderate	69 Good	63 Good	61 Good	60 Good
no2	6 Good	4 Good	4 Good	5 Good	6 Good	5 Good	4 Good	4 Good
so2	2 Good	1 Good	1 Good	1 Good	2 Good	1 Good	1 Good	1 Good
co	111 Good	105 Good	107 Good	112 Good	113 Good	114 Good	121 Good	121 Good

data source »

San Antonio

Wednesday, August 26, 2026 at 8:00 PM

PM2,5 12 (Good)

particulate matter (PM2.5) dust

PM10 17 (Good)

particulate matter (PM10) suspended dust

O3 98 (Moderate)

ozone (O3)

NO2 9.5 (Good)

nitrogen dioxide (NO2)

SO2 1.3 (Good)

sulfur dioxide (SO2)

CO 111 (Good)

carbon monoxide (CO)

San Antonio

index	2026-08-19	2026-08-20	2026-08-21	2026-08-22	2026-08-23	2026-08-24	2026-08-25	2026-08-26
pm25	8.7	11	15	14	10	7.7	8.5	9.5
pm10	13	15	26	21	14	10	12	14
o3	60	61	63	69	76	70	60	71
no2	4.3	4.5	5	6.2	5.1	4.5	4.5	6.4
so2	1.3	1.4	1.4	1.5	1.5	1.4	1.3	1.5
co	121	121	114	113	112	107	105	111

* Pollution data source: https://openaq.org () The data is licensed under CC-By 4.0

🌦️ Weather · 16-day Forecast — United States

16-day weather forecast for United States: today around 30°C (rain), lows near 19°C. Daily temperature and conditions, updated every day. Strong wind (about 25 km/h) is actively clearing smog and dust away.

☀️ UV Index · 16-day Forecast — United States

The UV index in United States today is 7.3 (high) — unprotected fair skin can burn in about 25 minutes.

📍 Air quality in nearby cities

Live PM2.5 around San Antonio — compare nearby locations.

New York City 20 µg/m³
Los Angeles 30 µg/m³
Chicago 10 µg/m³
Houston 15 µg/m³
Philadelphia 12 µg/m³
Phoenix 7 µg/m³
Bronx 20 µg/m³
Dallas 10 µg/m³

Frequently asked questions

Is the air safe to breathe in San Antonio today?

The current average PM2.5 across San Antonio is about 12 µg/m³, rated “Good”. Air quality is good — outdoor activities are fine for everyone.

What is the current PM2.5 level in San Antonio?

Right now PM2.5 in San Antonio averages about 12 µg/m³ (“Good”). PM2.5 are fine particles small enough to reach the lungs and bloodstream.

Which day last week had the worst air in San Antonio?

Over the past week, the highest daily PM2.5 in San Antonio was recorded on Friday, August 21 (about 15 µg/m³).

What is the UV index in San Antonio today?

The UV index in San Antonio today is 7.3 (high) — unprotected fair skin can burn in about 25 minutes.

Does today's wind help disperse smog in San Antonio?

Strong wind (about 25 km/h) is actively clearing smog and dust away.

How is air quality measured?

Air quality here is based on PM2.5 — the concentration of fine particulate matter in µg/m³. Lower values mean cleaner air. Data is updated daily from Open-Meteo.