What is the air quality in Boulder today?

The current Air Quality Index (AQI) in Boulder is 25 (Good). PM2.5 concentration is 6.0 µg/m³.

What is the temperature in Boulder right now?

The current temperature in Boulder is 19.4°C (feels like 19.4°C). Humidity is 29.2% and wind speed is 45.8 km/h.

Is it safe to go outside in Boulder?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 5.9 (High).

Air Quality in Boulder, United States

Windy

19.4°C · 29.2% humidity

19.4°

Feels 19.4°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Model forecast

Nearby Monitoring Stations

AQI Forecast

24 6am

25 9am

24 12pm

24 3pm

25 6pm

27 9pm

27 12am

25 3am

Air Quality Index Trend

45h · 47 stn

View full history →

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.

29.2%

Humidity

45.8 km/h

Wind E

1020.1 hPa

Pressure

5.9

UV High

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.0 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Boulder?

Temperature & Precipitation

PM2.5 Trend

45h · 47 stations

PM2.56.0 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX5.9

High

What is the 7-day forecast for Boulder?

09-05

27.6° 17.5°

0.06 mm

09-06

31.2° 8.1°

7.5 mm

09-07

30.6° 15.8°

2.81 mm

09-08

24.4° 16.4°

0.38 mm

09-09

30.8° 16.6°

1.06 mm

09-10

31.8° 9.7°

0.94 mm

09-11

27.4° 10.7°

0.13 mm

Both models agree Avg diff: 3.9°C

Where are air quality stations near Boulder?

Athens, Boulder-CU, Colorado, USA

0.4 km PM2.5: 2.4 µg/m³

Longmont Collocation 1

22.0 km PM2.5: 3.5 µg/m³

Longmont - Municipal, Colorado, USA

22.0 km PM2.5: 7.4 µg/m³

Fremont Elementary School

25.3 km PM2.5: 4.4 µg/m³

Westminster Town Hall

25.4 km PM2.5: 4.8 µg/m³

Northwest Open Space

25.8 km PM2.5: 4.6 µg/m³

Recreation Center, Senior Center, and Theatre

26.7 km PM2.5: 4.8 µg/m³

North Mor Elementary School

28.8 km PM2.5: 5.2 µg/m³

Westminster MAC

29.3 km PM2.5: 5.1 µg/m³

North Star

29.5 km PM2.5: 4.1 µg/m³

What cities are near Boulder?

25 Louisville 25 Broomfield 25 Erie 25 Longmont 27 Northglenn 26 Arvada 25 Golden 27 Thornton 26 Sherrelwood 26 Wheat Ridge

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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Data sources: Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-09-05T15:05 UTC.