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Air Quality History for Helena, United States

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

34
Current AQI
Good Station
48 Hours 7 Days 14 Days 20 Days
CSV JSON

Air Quality Index Station

475h

PM2.5 Station

475h · 3 stations

Temperature GFS model

80pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg Hours Stations
2026-06-09 32 28–35 7.6 µg/m³ 9h 3
2026-06-08 31 12–42 7.5 µg/m³ 24h 3
2026-06-07 36 22–48 8.7 µg/m³ 24h 3
2026-06-06 45 29–58 10.8 µg/m³ 24h 3
2026-06-05 44 32–55 10.5 µg/m³ 24h 3
2026-06-04 40 28–48 9.5 µg/m³ 24h 3
2026-06-03 35 20–53 8.4 µg/m³ 24h 3
2026-06-02 31 19–47 7.3 µg/m³ 24h 3
2026-06-01 33 21–51 8.0 µg/m³ 23h 3
2026-05-31 30 21–40 7.2 µg/m³ 24h 3
2026-05-30 27 16–46 6.5 µg/m³ 24h 3
2026-05-29 25 19–30 5.9 µg/m³ 22h 3
2026-05-28 25 17–34 5.9 µg/m³ 23h 3
2026-05-27 23 16–32 5.6 µg/m³ 24h 3
2026-05-26 22 11–36 5.2 µg/m³ 24h 3
2026-05-25 22 16–34 5.1 µg/m³ 24h 3
2026-05-24 24 15–37 5.7 µg/m³ 24h 3
2026-05-23 25 15–55 5.9 µg/m³ 24h 3
2026-05-22 21 12–28 5.0 µg/m³ 24h 3
2026-05-21 27 20–37 6.4 µg/m³ 24h 3
2026-05-20 32 23–43 7.7 µg/m³ 14h 3
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