Longmont - Municipal, Colorado, USA Air Quality

Monitoring Station · Longmont, United States
54
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Last Reading

Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast Calibrated
76 8pm
54
41
41 11pm
41
41
48 2am
48
48
48 5am
48
48
48 8am
41
41
— 11am
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—
— 2pm
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— 5pm
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Station readings
76
54
CAMS model adj +14
34
27
27
27
27
27
34
34
34
34
34
34
34
27
27

Air Quality Forecast (24h)

PM2.513.5 µg/m³ ✓ WHO
Moderate
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Nearby Monitoring Stations

64
Longmont Collocation 1
0.0 km PM2.5: 18.5 µg/m³
76
Platteville Middle School
24.0 km PM2.5: 24.0 µg/m³
87
Silver Creek
24.9 km PM2.5: 29.1 µg/m³
77
Trail Winds Recreation Center
29.0 km PM2.5: 24.6 µg/m³
71
Anythink Brighton Library
31.0 km PM2.5: 21.4 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 2026-08-07T23:58 UTC.