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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.

69
Current AQI
Moderate Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

333h

PM2.5 Station

333h · 103 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg Hours Stations
2026-10-21 61 52–69 16.7 µg/m³ 7h 105
2026-10-20 53 32–71 13.9 µg/m³ 24h 93
2026-10-19 28 21–42 6.6 µg/m³ 24h 106
2026-10-18 23 18–37 5.6 µg/m³ 24h 98
2026-10-17 16 13–25 3.9 µg/m³ 24h 106
2026-10-16 18 11–34 4.4 µg/m³ 24h 101
2026-10-15 24 14–40 5.8 µg/m³ 24h 106
2026-10-14 38 19–52 9.2 µg/m³ 24h 105
2026-10-13 34 24–48 8.2 µg/m³ 24h 106
2026-10-12 42 32–55 10.2 µg/m³ 24h 106
2026-10-11 31 29–34 7.4 µg/m³ 24h 107
2026-10-10 31 24–48 7.3 µg/m³ 24h 93
2026-10-09 35 25–45 8.4 µg/m³ 24h 96
2026-10-08 25 19–34 5.9 µg/m³ 24h 104
2026-10-07 27 25–29 6.5 µg/m³ 14h 104
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