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Air Quality History for St. Charles, United States

Historical PM2.5 and AQI trend from monitoring stations near St. Charles, United States.

13
Current AQI
Good Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

478h

PM2.5 Station

478h · 24 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg Hours Stations
2026-10-21 26 20–30 6.1 µg/m³ 12h 20
2026-10-20 22 14–35 5.4 µg/m³ 24h 17
2026-10-19 25 18–32 6.0 µg/m³ 24h 20
2026-10-18 17 12–22 4.2 µg/m³ 24h 18
2026-10-17 16 11–25 3.7 µg/m³ 24h 18
2026-10-16 34 16–77 8.6 µg/m³ 24h 19
2026-10-15 29 18–54 7.1 µg/m³ 24h 20
2026-10-14 41 34–57 9.9 µg/m³ 24h 18
2026-10-13 26 17–36 6.1 µg/m³ 24h 18
2026-10-12 15 10–27 3.6 µg/m³ 24h 19
2026-10-11 16 11–20 3.9 µg/m³ 24h 21
2026-10-10 31 18–39 7.4 µg/m³ 24h 19
2026-10-09 27 18–52 6.5 µg/m³ 24h 20
2026-10-08 27 19–33 6.4 µg/m³ 24h 22
2026-10-07 25 21–33 6.0 µg/m³ 24h 20
2026-10-06 21 16–27 4.9 µg/m³ 24h 21
2026-10-05 24 18–28 5.6 µg/m³ 24h 22
2026-10-04 21 16–29 5.0 µg/m³ 24h 22
2026-10-03 25 15–53 6.0 µg/m³ 24h 25
2026-10-02 46 37–53 11.1 µg/m³ 24h 25
2026-10-01 41 36–45 9.8 µg/m³ 10h 23
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