Longmont - Municipal, Colorado, USA Air Quality

Monitoring Station · Longmont, United States
15
Good
Air quality is satisfactory. Enjoy outdoor activities.
Last Reading

Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast Calibrated
50 4pm
35
35
15 7pm
35
35
35 10pm
35
35
35 1am
35
37
37 4am
37
44
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Station readings
50
15
CAMS model adj +10
25
25
25
25
25
25
25
25
25
25
25
27
27
27
34

Air Quality Forecast (24h)

PM2.53.6 µg/m³ ✓ WHO
Good
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Nearby Monitoring Stations

50
Longmont Collocation 1
0.0 km PM2.5: 12.0 µg/m³
9
united-states-of-america-boulder-joslyn-court
20.3 km PM2.5: 2.1 µg/m³
20
Athens, Boulder-CU, Colorado, USA
22.0 km PM2.5: 4.8 µg/m³
29
Platteville Middle School
24.0 km PM2.5: 7.0 µg/m³
50
Silver Creek
24.9 km PM2.5: 12.0 µg/m³
42
Trail Winds Recreation Center
29.0 km PM2.5: 10.0 µg/m³
51
Anythink Brighton Library
31.0 km PM2.5: 12.3 µg/m³

Nearby Cities

50 Longmont 41 Erie 35 Louisville 30 Boulder 32 Loveland 36 Broomfield 37 Northglenn 34 Thornton 34 Sherrelwood

Station data from AQICN. AQI forecast from ECMWF CAMS. AQI calculated using US EPA standard. Updated 2026-05-29T19:19 UTC.