What is the air quality in Boulder today?

The current Air Quality Index (AQI) in Boulder is 14 (Good). PM2.5 concentration is 3.4 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 13.5% and wind speed is 35.2 km/h.

Is it safe to go outside in Boulder?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Boulder, United States

Clear

19.4°C · 13.5% humidity

19.4°

Feels 19.4°

Good

Air quality is satisfactory. Enjoy outdoor activities.

4 stations

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

45h · 43 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.

13.5%

Humidity

35.2 km/h

Wind E

1021.6 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

3.4 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Boulder?

Temperature & Precipitation

PM2.5 Trend

45h · 43 stations

PM2.53.4 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

Station readings (4 stations within 25 km)

3.4

Median

5.56

Average

3.4

Low

7.2

High

PM2.5 µg/m³ · Model: 6.5 · Bias: +3.1

What is the 7-day forecast for Boulder?

10-20

20.3° 6.5°

10-21

20.4° 5.4°

10-22

12.4° 4.1°

10-23

9.8° -3.8°

5.25 mm

10-24

17.2° 11.9°

10-25

16.0° 5.0°

0.06 mm

10-26

20.6° 3.9°

Both models agree Avg diff: 4.7°C

Where are air quality stations near Boulder?

Athens, Boulder-CU, Colorado, USA

0.4 km PM2.5: 3.1 µg/m³

Athens, Boulder-CU, Colorado, USA

0.4 km PM2.5: 3.6 µg/m³

Longmont Collocation 1

22.0 km PM2.5: 5.5 µg/m³

Longmont - Municipal, Colorado, USA

22.0 km PM2.5: 6.0 µg/m³

Longmont - Municipal, Colorado, USA

22.0 km PM2.5: 7.2 µg/m³

Longmont - Municipal, Colorado, USA

22.0 km PM2.5: 6.5 µg/m³

Fremont Elementary School

25.3 km PM2.5: 10.8 µg/m³

Westminster Town Hall

25.4 km PM2.5: 11.9 µg/m³

Northwest Open Space

25.8 km PM2.5: 12.4 µg/m³

Recreation Center, Senior Center, and Theatre

26.7 km PM2.5: 12.8 µg/m³

What cities are near Boulder?

40 Louisville 44 Broomfield 38 Erie 26 Longmont 45 Northglenn 40 Arvada 31 Golden 42 Thornton 44 Sherrelwood 38 Wheat Ridge

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

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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 2026-10-20T20:04 UTC.