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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.

50
Current AQI
Good Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

477h

PM2.5 Station

477h · 103 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg PM10 avg Hours Stations
2026-10-20 53 23–72 14.0 µg/m³ — 23h 90
2026-10-19 28 22–42 6.6 µg/m³ — 24h 103
2026-10-18 24 18–38 5.8 µg/m³ — 24h 95
2026-10-17 16 13–25 3.9 µg/m³ — 24h 104
2026-10-16 18 10–34 4.4 µg/m³ — 24h 99
2026-10-15 24 14–40 5.8 µg/m³ — 24h 104
2026-10-14 38 18–53 9.2 µg/m³ 1.5 24h 104
2026-10-13 34 25–48 8.1 µg/m³ 6.6 24h 104
2026-10-12 42 32–55 10.3 µg/m³ 4.0 24h 104
2026-10-11 31 29–34 7.4 µg/m³ 15.3 24h 104
2026-10-10 30 24–48 7.3 µg/m³ 54.2 24h 92
2026-10-09 34 19–45 8.1 µg/m³ — 24h 93
2026-10-08 24 20–34 5.8 µg/m³ — 24h 102
2026-10-07 25 18–29 6.1 µg/m³ — 24h 98
2026-10-06 24 20–30 5.7 µg/m³ — 24h 98
2026-10-05 27 18–34 6.4 µg/m³ — 24h 102
2026-10-04 27 19–42 6.4 µg/m³ — 23h 98
2026-10-03 23 17–32 5.4 µg/m³ 15.4 24h 99
2026-10-02 16 14–18 3.9 µg/m³ — 24h 102
2026-10-01 55 20–62 14.6 µg/m³ 1.1 23h 101
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