Get a monitor and contributor to air quality data in your city.
Air Quality 
Air Monitors
Air Purifiers
For Business
News
Support
Air quality in San Marcos
Air quality index (AQI) and PM2.5 air pollution in San Marcos
223 people follow this city
San Marcos Air Quality Map
Real-time San Marcos air pollution map
AIR QUALITY DATA CONTRIBUTORS
Texas Commission on Environmental Quality (TCEQ)
See all
Pollen
What is the pollen count in San Marcos today?
 | Index | High | |
 | Tree pollen | High | |
 | Grass pollen | Moderate | |
 | Weed pollen | None |
Source: tomorrow.io
Weather
What is the current weather in San Marcos?
| Weather | Mist |
| Temperature | 78.8°F |
| Humidity | 78% |
| Wind | 10.4 mp/h |
| Pressure | 29.7 Hg |
live aqi city ranking
Real-time USA city ranking
| # | city | US AQI |
|---|---|---|
| 1 |  Duluth, Minnesota | 164 |
| 2 | Detroit Lakes, Minnesota | 136 |
| 3 | Fort Thompson, South Dakota | 107 |
| 4 | Corpus Christi, Texas | 98 |
| 5 | Hot Springs, South Dakota | 88 |
| 6 | Houghton, Michigan | 78 |
| 7 | Fontana, California | 75 |
| 8 | Glendale, California | 72 |
| 9 | San Fernando, California | 72 |
| 10 | Malibu, California | 71 |
(local time)
SEE WORLD AQI RANKING
3D animated air pollution map
live San Marcos aqi ranking
Real-time San Marcos air quality ranking
| # | station | US AQI |
|---|---|---|
| 1 | CAPCOG San Marcos Staples Road | 60 |
(local time)
SEE WORLD AQI RANKING
US AQI
60
live AQI index
Moderate
Overview
What is the current air quality in San Marcos?
| Air pollution level | Air quality index | Main pollutant |
|---|---|---|
| Moderate | 60 US AQI | PM2.5 |
| Pollutants | Concentration | |
|---|---|---|
| PM2.5 | 13.9µg/m³ | |
!
PM2.5
x2.8
PM2.5 concentration in San Marcos is currently 2.8 times the WHO annual air quality guideline value
Health Recommendations
What is the current air quality in San Marcos?
 | Sensitive groups should reduce outdoor exercise |
 | Close your windows to avoid dirty outdoor air GET A MONITOR |
 | Sensitive groups should wear a mask outdoors GET A MASK |
 | Sensitive groups should run an air purifier GET AN AIR PURIFIER |
Forecast
San Marcos air quality index (AQI) forecast
| Day | Pollution level | Weather | Temperature | Wind |
|---|---|---|---|---|
| Thursday, May 9 | Moderate 54 AQI US |  | 80.6° 68° |  20.1 mp/h |
| Friday, May 10 | Good 32 AQI US  | | 80.6° 64.4° | 13.4 mp/h |
| Saturday, May 11 | Moderate 52 AQI US | | 78.8° 66.2° | 8.9 mp/h |
| Today | Moderate 60 AQI US | 100% | 78.8° 66.2° | 8.9 mp/h |
| Monday, May 13 | Moderate 62 AQI US | 100% | 86° 62.6° | 17.9 mp/h |
| Tuesday, May 14 | Moderate 60 AQI US |  | 87.8° 62.6° | 8.9 mp/h |
| Wednesday, May 15 | Moderate 58 AQI US | 80% | 86° 66.2° | 13.4 mp/h |
| Thursday, May 16 | Moderate 59 AQI US | 100% | 86° 68° | 11.2 mp/h |
| Friday, May 17 | Moderate 78 AQI US | 90% | 84.2° 71.6° | 11.2 mp/h |
| Saturday, May 18 | Moderate 79 AQI US | 100% | 73.4° 64.4° | 15.7 mp/h |
| Sunday, May 19 | Moderate 80 AQI US | 100% | 86° 62.6° | 6.7 mp/h |
Interested in hourly forecast? Get the app
News
The latest air quality news and resources.
How to best protect from air pollution?
San Marcos air quality data attribution
1Contributor
Government Contributor
2 Data sources
Where is the cleanest air quality in San Marcos?
AQI US, Metric