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Air Quality History for Longmont, United States

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

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

Air Quality Index Station

334h

PM2.5 Station

334h · 40 stations

Temperature GFS model

56pt

Precipitation GFS model

mm/day

Daily Summary Station

Date AQI Range PM2.5 avg PM10 avg Hours Stations
2026-10-21 23 23–23 5.5 µg/m³ 30.9 1h 40
2026-10-20 33 23–42 7.9 µg/m³ 48.4 24h 32
2026-10-19 25 19–37 5.9 µg/m³ 32.4 24h 36
2026-10-18 22 15–36 5.4 µg/m³ 14.5 24h 35
2026-10-17 24 15–34 5.8 µg/m³ 15.8 24h 37
2026-10-16 25 15–46 6.0 µg/m³ 15.9 24h 33
2026-10-15 17 12–24 4.2 µg/m³ 6.3 24h 37
2026-10-14 20 12–25 4.7 µg/m³ 9.1 24h 38
2026-10-13 24 18–35 5.9 µg/m³ 29.1 24h 39
2026-10-12 17 14–21 4.2 µg/m³ 51.4 24h 38
2026-10-11 22 17–26 5.2 µg/m³ 26.2 24h 37
2026-10-10 22 19–25 5.3 µg/m³ 23.3 24h 34
2026-10-09 26 16–68 6.3 µg/m³ 43.6 24h 36
2026-10-08 34 20–54 8.1 µg/m³ 40.6 24h 40
2026-10-07 31 25–47 7.5 µg/m³ 37.1 21h 39
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