Air Quality in Boulder, United States

Windy
27.5°C · 16.2% humidity
27.5°
Feels 27.5°
16
Good
Air quality is satisfactory. Enjoy outdoor activities.
4 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
29 9am
29
29
16 12pm
20
22
24 3pm
26
27
27 6pm
28
28
30 9pm
31
31
38 12am
31
31
31 3am
31
31
31 6am
31
29
Station readings
42
24
21
CAMS model adj +4
25
25
25
25
25
25
25
25
25
25
25
25
27
27
27
34
27
27
27
27
27
27
27
25
AD 728×90

Air Quality Index Trend

17h · 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.

16.2%
Humidity
47.3 km/h
Wind E
1014.5 hPa
Pressure
24.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5
16
3.84 µg/m³
PM10▲
19
20.55 µg/m³
050100150200300500

What is the weather forecast for Boulder?

Temperature & Precipitation

PM2.5 Trend

17h · 1 station
PM2.53.84 µg/m³ ✓ WHO
Good
PM1020.55 µg/m³
Good
UV INDEX24.9
Extreme
AD 300×250
Station readings (4 stations within 25 km)
3.84
Median
8.33
Average
3.8
Low
12.15
High
PM2.5 µg/m³ · Model: 7.1 · Bias: +3.3

What is the 7-day forecast for Boulder?

05-29
27.5° 10.3°
5.38 mm
05-30
27.2° 11.4°
1.31 mm
05-31
28.2° 12.9°
2.12 mm
06-01
24.6° 11.9°
0.31 mm
06-02
31.9° 15.8°
06-03
32.9° 13.7°
06-04
30.8° 10.1°
10.25 mm
Both models agree Avg diff: 4.3°C

Where are air quality stations near Boulder?

35
Athens, Boulder-CU, Colorado, USA
0.4 km PM2.5: 8.4 µg/m³
–
united-states-of-america-boulder-joslyn-court
2.5 km
51
Longmont Collocation 1
22.0 km PM2.5: 12.1 µg/m³
50
Longmont - Municipal, Colorado, USA
22.0 km PM2.5: 12.0 µg/m³
39
Fremont Elementary School
25.3 km PM2.5: 9.3 µg/m³
39
Westminster Town Hall
25.4 km PM2.5: 9.4 µg/m³
51
Northwest Open Space
25.8 km PM2.5: 12.1 µg/m³
38
North Mor Elementary School
28.8 km PM2.5: 9.1 µg/m³
27
North Star
29.5 km PM2.5: 6.4 µg/m³

What cities are near Boulder?

35 Louisville 37 Broomfield 43 Erie 51 Longmont 36 Northglenn 34 Arvada 33 Golden 33 Thornton 34 Sherrelwood 32 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 2026-05-29T18:24 UTC.