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Air Quality History for Helena, United States

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

19
Current AQI
Good Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

313h

PM2.5 Station

313h · 3 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg Hours Stations
2026-10-21 38 38–38 9.2 µg/m³ 1h 3
2026-10-20 36 20–53 8.7 µg/m³ 22h 2
2026-10-19 28 20–51 6.8 µg/m³ 22h 2
2026-10-18 20 12–32 4.9 µg/m³ 24h 2
2026-10-17 18 12–35 4.4 µg/m³ 23h 2
2026-10-16 51 21–76 13.8 µg/m³ 22h 3
2026-10-15 57 32–83 15.9 µg/m³ 23h 2
2026-10-14 49 28–75 12.7 µg/m³ 22h 3
2026-10-13 52 37–71 13.2 µg/m³ 22h 3
2026-10-12 45 25–72 11.3 µg/m³ 23h 2
2026-10-11 25 16–34 6.0 µg/m³ 22h 3
2026-10-10 29 22–38 7.0 µg/m³ 23h 2
2026-10-09 45 32–65 11.3 µg/m³ 23h 2
2026-10-08 48 30–75 12.3 µg/m³ 22h 2
2026-10-07 36 30–47 8.7 µg/m³ 19h 2
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