Home › United States › San Marcos › History

Air Quality History for San Marcos, United States

Historical PM2.5 and AQI trend from monitoring stations near San Marcos, United States.

20
Current AQI
Good Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

320h

PM2.5 Station

320h · 6 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg PM10 avg Hours Stations
2026-10-20 33 15–80 8.3 µg/m³ 24.0 20h 4
2026-10-19 23 15–39 5.5 µg/m³ 19.3 24h 5
2026-10-18 22 9–70 5.6 µg/m³ 10.9 23h 4
2026-10-17 15 8–33 3.6 µg/m³ 11.3 23h 4
2026-10-16 24 7–74 6.0 µg/m³ 19.2 23h 4
2026-10-15 24 11–71 5.9 µg/m³ 22.1 23h 4
2026-10-14 25 11–48 6.0 µg/m³ 19.4 23h 5
2026-10-13 22 8–42 5.4 µg/m³ 18.0 23h 4
2026-10-12 23 10–42 5.5 µg/m³ 20.8 21h 4
2026-10-11 24 10–43 5.6 µg/m³ 17.5 24h 5
2026-10-10 30 17–58 7.3 µg/m³ 18.5 24h 4
2026-10-09 43 17–63 10.5 µg/m³ 26.1 23h 5
2026-10-08 36 18–56 8.7 µg/m³ 22.8 22h 5
2026-10-07 35 23–80 8.9 µg/m³ 23.5 24h 5
Back to San Marcos Air Quality