Air Quality in Boulder, United States

Drizzle
12.5°C · 33.2% humidity
12.5°
Feels 12.5°
23
Good
Air quality is satisfactory. Enjoy outdoor activities.
1 station

Nearby Monitoring Stations

AQI Forecast Calibrated
172 6pm
22
72
72 9pm
72
85
85 12am
97
97
110 3am
110
110
110 6am
110
97
97 9am
85
85
85 12pm
85
85
85 3pm
85
85
Station readings
172
22
CAMS model adj +60
12
12
12
12
12
25
25
37
37
50
50
50
50
50
37
37
25
25
25
25
25
25
25
25
AD 728×90

PM2.5 Trend (24h)

25h · 37 stations
33.2%
Humidity
23.7 km/h
Wind W
1007.5 hPa
Pressure
1.4
UV Low
GoodModerateUSGUnhealthyVery UnhealthyHazardous

What is the weather forecast for Boulder?

Temperature & Precipitation

PM2.55.58 µg/m³ ✓ WHO
Good
PM1013.7 µg/m³
Good
UV INDEX1.4
Low
AD 300×250
Station readings (1 station within 25 km)
5.58
Median
5.58
Average
5.58
Low
5.58
High
PM2.5 µg/m³ · Model: 4.4 · Bias: -1.2

What is the 7-day forecast for Boulder?

04-09
17.8° 5.7°
1.31 mm
04-10
12.5° 7.2°
6.94 mm
04-11
15.8° 4.8°
3.94 mm
04-12
16.2° 3.8°
1.88 mm
04-13
12.8° 3.3°
0.75 mm
04-14
9.4° -0.3°
7.88 mm
04-15
9.7° 1.2°
0.13 mm
Both models agree Avg diff: 5.0°C

Where are air quality stations near Boulder?

–
united-states-of-america-boulder-joslyn-court
2.5 km PM2.5: 0.0 µg/m³ PM10: 0.0 µg/m³
21
Longmont Collocation 1
22.0 km PM2.5: 5.1 µg/m³
32
Fremont Elementary School
25.3 km PM2.5: 7.8 µg/m³
25
Northwest Open Space
25.8 km PM2.5: 5.9 µg/m³
165
Recreation Center, Senior Center, and Theatre
26.7 km PM2.5: 82.9 µg/m³
23
North Mor Elementary School
28.8 km PM2.5: 5.4 µg/m³
19
North Star
29.5 km PM2.5: 4.6 µg/m³

What cities are near Boulder?

25 Louisville 26 Broomfield 25 Erie 22 Longmont 25 Northglenn 26 Arvada 28 Golden 25 Thornton 26 Sherrelwood 26 Wheat Ridge

Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-04-09T21:22 UTC.