Air Quality in San Marcos, United States

Cloudy
23.4°C · 87.5% humidity
23.4°
Feels 23.4°
34
Good
Air quality is satisfactory. Enjoy outdoor activities.
Calibrated model

Nearby Monitoring Stations

AQI Forecast
27 7pm
27
27
34 10pm
32
31
30 1am
29
28
26 4am
26
27
27 7am
27
27
34 10am
34
34
34 1pm
34
34
34 4pm
27
27
AD 728×90

Air Quality Index Trend

48h · 2 stn

San Marcos's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

87.5%
Humidity
39.2 km/h
Wind SSW
1012.9 hPa
Pressure
0.7
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous
PM2.5
34
8.16 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

Temperature & Precipitation

PM2.5 Trend

48h · 2 stations
PM2.58.16 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX0.7
Low
AD 300×250
06-09
34.5° 19.1°
1.19 mm
06-10
30.6° 22.2°
0.13 mm
06-11
32.4° 22.7°
06-12
33.5° 22.7°
06-13
31.6° 23.0°
1.44 mm
06-14
33.8° 22.7°
06-15
35.3° 23.3°
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-06-09T03:03 UTC.