Longmont - Municipal, Colorado, USA Air Quality

Monitoring Station · Longmont, United States
31
Good
Air quality is satisfactory. Enjoy outdoor activities.
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Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast Calibrated
31 12pm
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29 3pm
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28 6pm
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28 9pm
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29 12am
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31
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CAMS model adj +4
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27

Air Quality Forecast (24h)

PM2.57.4 µg/m³ ✓ WHO
Good
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Nearby Monitoring Stations

16
Longmont - Municipal, Colorado, USA
0.0 km PM2.5: 3.8 µg/m³
15
Longmont Collocation 1
0.0 km PM2.5: 3.5 µg/m³
17
Platteville Middle School
24.0 km PM2.5: 4.0 µg/m³
25
Silver Creek
24.9 km PM2.5: 6.1 µg/m³
20
Trail Winds Recreation Center
29.0 km PM2.5: 4.9 µg/m³
19
Anythink Brighton Library
31.0 km PM2.5: 4.6 µg/m³

Nearby Cities

15 Longmont 20 Erie 20 Louisville 15 Boulder 19 Loveland 20 Broomfield 20 Northglenn 19 Thornton 20 Sherrelwood

Station data from AQICN. AQI forecast from ECMWF CAMS. AQI calculated using US EPA standard. Updated 2026-09-05T15:48 UTC.