Air Quality in Boulder, United States

Clear
35.7°C · 7.7% humidity
35.7°
Feels 35.7°
58
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
16 2pm
16
16
58 5pm
46
38
31 8pm
27
24
22 11pm
20
19
18 2am
17
17
17 5am
17
18
18 8am
18
18
16 11am
15
15
Station readings
10
16
24
CAMS model adj -9
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
25
27
27
27
27
25
24
24
AD 728×90

Air Quality Index Trend

8h · 1 stn

Boulder's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Boulder is 1.0× the WHO 24-hour guideline of 15 µg/m³.

7.7%
Humidity
6.0 km/h
Wind WSW
999.2 hPa
Pressure
6.9
UV High
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
58
15.19 µg/m³
PM10
13
13.7 µg/m³
050100150200300500

What is the weather forecast for Boulder?

Temperature & Precipitation

PM2.5 Trend

8h · 1 station
PM2.515.19 µg/m³ ✓ WHO
Moderate
PM1013.7 µg/m³
Good
UV INDEX6.9
High
AD 300×250
Station readings (2 stations within 25 km)
15.19
Median
10.13
Average
4.87
Low
15.4
High
PM2.5 µg/m³ · Model: 6.0 · Bias: -9.2

What is the 7-day forecast for Boulder?

06-08
27.2° 14.8°
06-09
35.7° 18.4°
06-10
31.0° 13.0°
06-11
29.5° 14.5°
0.13 mm
06-12
32.4° 14.4°
0.88 mm
06-13
35.0° 13.9°
0.38 mm
06-14
27.0° 19.9°
1.25 mm
Both models agree Avg diff: 5.2°C

Where are air quality stations near Boulder?

61
Athens, Boulder-CU, Colorado, USA
0.4 km PM2.5: 16.9 µg/m³
24
united-states-of-america-boulder-joslyn-court
2.5 km PM2.5: 5.8 µg/m³ PM10: 5.8 µg/m³
33
Longmont Collocation 1
22.0 km PM2.5: 8.0 µg/m³
29
Longmont - Municipal, Colorado, USA
22.0 km PM2.5: 7.0 µg/m³
42
Fremont Elementary School
25.3 km PM2.5: 10.1 µg/m³
41
Westminster Town Hall
25.4 km PM2.5: 9.8 µg/m³
36
Northwest Open Space
25.8 km PM2.5: 8.6 µg/m³
32
North Mor Elementary School
28.8 km PM2.5: 7.8 µg/m³
25
North Star
29.5 km PM2.5: 5.9 µg/m³

What cities are near Boulder?

45 Louisville 45 Broomfield 42 Erie 40 Longmont 25 Northglenn 25 Arvada 25 Golden 25 Thornton 25 Sherrelwood 25 Wheat Ridge
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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-06-08T23:09 UTC.