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
936 people follow this city
San Marcos Air Quality Map
Real-time San Marcos air pollution map
AIR QUALITY DATA CONTRIBUTORS
Anonymous contributor
See all
Pollen
What is the pollen count in San Marcos today?
 | Index | Low | |
 | Tree pollen | Low | |
 | Grass pollen | None | |
 | Weed pollen | None |
Source: tomorrow.io
Weather
What is the current weather in San Marcos?
| Weather | Broken clouds |
| Temperature | 55.4°F |
| Humidity | 87% |
| Wind | 5.7 mp/h |
| Pressure | 29.9 Hg |
live aqi city ranking
Real-time USA city ranking
| # | city | US AQI |
|---|---|---|
| 1 | Corpus Christi, Texas | 82 |
| 2 | Georgetown, Texas | 69 |
| 3 | The Woodlands, Texas | 65 |
| 4 | Phoenix, Arizona | 64 |
| 5 | Waynesville, North Carolina | 64 |
| 6 | Gatlinburg, Tennessee | 63 |
| 7 | Chattanooga, Tennessee | 62 |
| 8 | Round Rock, Texas | 61 |
| 9 | Alpharetta, Georgia | 60 |
| 10 | Austin, Texas | 60 |
(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 | Tucana Drive | 5 |
| 2 | East Barham Drive | 4 |
| 3 | CSUSM COMMONS | 2 |
(local time)
SEE WORLD AQI RANKING
US AQI
5
live AQI index
Good
Overview
What is the current air quality in San Marcos?
| Air pollution level | Air quality index | Main pollutant |
|---|---|---|
| Good | 5 US AQI | PM2.5 |
| Pollutants | Concentration | |
|---|---|---|
| PM2.5 | 1.2µg/m³ | |
✓
PM2.5 concentration in San Marcos air currently meets the WHO annual air quality guideline value
Health Recommendations
What is the current air quality in San Marcos?
 | Enjoy outdoor activities |
 | Open your windows to bring clean, fresh air indoors GET A MONITOR |
Forecast
San Marcos air quality index (AQI) forecast
| Day | Pollution level | Weather | Temperature | Wind |
|---|---|---|---|---|
| Tuesday, Apr 23 | Good 4 AQI US |  | 64.4° 55.4° |  11.2 mp/h |
| Wednesday, Apr 24 | Good 5 AQI US |  | 62.6° 53.6° | 11.2 mp/h |
| Thursday, Apr 25 | Good 5 AQI US | | 60.8° 53.6° | 11.2 mp/h |
| Today | Good 5 AQI US | | 66.2° 53.6° | 8.9 mp/h |
| Saturday, Apr 27 | Good 21 AQI US |  | 69.8° 51.8° | 8.9 mp/h |
| Sunday, Apr 28 | Good 28 AQI US | | 69.8° 53.6° | 8.9 mp/h |
| Monday, Apr 29 | Good 31 AQI US | | 68° 53.6° | 8.9 mp/h |
| Tuesday, Apr 30 | Good 18 AQI US | | 68° 53.6° | 11.2 mp/h |
| Wednesday, May 1 | Good 17 AQI US | | 77° 55.4° | 8.9 mp/h |
| Thursday, May 2 | Good 18 AQI US | | 75.2° 57.2° | 8.9 mp/h |
Interested in hourly forecast? Get the app
News
The latest air quality news and resources.
San Marcos air quality data attribution
3Contributors
- 3 Anonymous contributors
3 stations
3 Anonymous Contributors
1 Data source
Data validated and calibrated by IQAirWhere is the cleanest air quality in San Marcos?
AQI US, Metric