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Air Quality History for Helena, United States

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

31
Current AQI
Good Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

413h

PM2.5 Station

413h · 3 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg Hours Stations
2026-07-21 44 21–73 11.2 µg/m³ 16h 3
2026-07-20 47 20–110 13.1 µg/m³ 20h 2
2026-07-19 49 27–152 13.3 µg/m³ 19h 3
2026-07-18 42 19–147 11.4 µg/m³ 18h 3
2026-07-17 63 33–183 22.0 µg/m³ 23h 3
2026-07-16 46 27–177 14.3 µg/m³ 22h 3
2026-07-15 32 16–71 7.9 µg/m³ 23h 3
2026-07-14 30 20–51 7.1 µg/m³ 20h 3
2026-07-13 25 16–33 6.0 µg/m³ 20h 3
2026-07-12 31 20–46 7.5 µg/m³ 23h 3
2026-07-11 29 18–47 6.9 µg/m³ 23h 3
2026-07-10 32 1–63 7.9 µg/m³ 23h 3
2026-07-09 36 29–48 8.6 µg/m³ 23h 3
2026-07-08 35 27–46 8.4 µg/m³ 24h 3
2026-07-07 33 21–52 8.0 µg/m³ 22h 3
2026-07-06 34 27–46 8.3 µg/m³ 12h 3
2026-07-05 70 30–137 22.4 µg/m³ 24h 3
2026-07-04 40 32–55 9.7 µg/m³ 24h 3
2026-07-03 48 38–58 11.6 µg/m³ 24h 3
2026-07-02 52 34–65 13.1 µg/m³ 10h 3
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