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Primary air pollutant in the San Marcos area:
PM2.5 - 53 Moderate
If you are unusually sensitive to particle pollution, consider reducing your activity level or shorten the amount of time you are active outdoors.
Other Pollutants:
OZONE - 22 Good
PM10 - 13 Good
https://www.tceq.texas.gov/airquality/monops/forecast_today.html
Primary Pollutant: OZONE - 0 Good
Secondary Pollutant: PM2.5 - 0 Good
Secondary Pollutant: PM10 - 0 Good
Primary Pollutant: OZONE - 0 Good
Secondary Pollutant: PM2.5 - 0 Good
Secondary Pollutant: PM10 - 0 Good
Primary Pollutant: OZONE - 0 Good
Secondary Pollutant: PM2.5 - 0 Good
Secondary Pollutant: PM10 - 0 Good
Primary Pollutant: OZONE - 0 Good
Secondary Pollutant: PM2.5 - 0 Good
Secondary Pollutant: PM10 - 0 Good