Longmont - Municipal, Colorado, USA Air Quality

Monitoring Station · Longmont, United States
80
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Last Reading

Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast Calibrated
119 3am
80
66
66 6am
66
66
59 9am
59
59
59 12pm
59
59
59 3pm
59
59
— 6pm
—
—
— 9pm
—
—
— 12am
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Station readings
119
80
CAMS model adj +32
34
34
34
34
34
34
27
27
27
27
27
27
27
27
27

Air Quality Forecast (24h)

PM2.525.9 µg/m³ ×1.7 WHO
Moderate
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Nearby Monitoring Stations

61
Longmont Collocation 1
0.0 km PM2.5: 16.7 µg/m³
63
Platteville Middle School
24.0 km PM2.5: 18.0 µg/m³
86
Silver Creek
24.9 km PM2.5: 28.9 µg/m³
75
Trail Winds Recreation Center
29.0 km PM2.5: 23.6 µg/m³
61
Anythink Brighton Library
31.0 km PM2.5: 17.0 µg/m³

Nearby Cities

42 Longmont 31 Erie 31 Louisville 31 Boulder 42 Loveland 51 Broomfield 51 Northglenn 51 Thornton 51 Sherrelwood

Station data from AQICN. AQI forecast from ECMWF CAMS. AQI calculated using US EPA standard. Updated 2026-08-08T06:33 UTC.