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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.

40
Current AQI
Good Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

477h

PM2.5 Station

477h · 104 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg Hours Stations
2026-09-05 44 23–55 10.8 µg/m³ 16h 105
2026-09-04 42 24–52 10.1 µg/m³ 24h 104
2026-09-03 46 31–56 11.3 µg/m³ 24h 105
2026-09-02 55 52–58 14.1 µg/m³ 24h 105
2026-09-01 56 44–60 14.4 µg/m³ 24h 101
2026-08-31 53 45–60 13.3 µg/m³ 24h 106
2026-08-30 46 40–56 11.1 µg/m³ 24h 107
2026-08-29 55 44–63 14.4 µg/m³ 24h 107
2026-08-28 46 36–54 11.1 µg/m³ 24h 107
2026-08-27 42 39–48 10.0 µg/m³ 24h 108
2026-08-26 44 35–55 10.7 µg/m³ 24h 110
2026-08-25 35 25–44 8.3 µg/m³ 24h 110
2026-08-24 45 24–60 11.4 µg/m³ 24h 109
2026-08-23 51 35–87 14.0 µg/m³ 24h 109
2026-08-22 41 35–52 9.9 µg/m³ 24h 105
2026-08-21 55 44–60 14.0 µg/m³ 24h 105
2026-08-20 44 32–54 10.5 µg/m³ 24h 105
2026-08-19 31 18–40 7.5 µg/m³ 24h 101
2026-08-18 31 22–35 7.4 µg/m³ 24h 98
2026-08-17 24 18–35 5.7 µg/m³ 24h 101
2026-08-16 32 31–33 7.6 µg/m³ 5h 106
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