What is the air quality in Herndon today?

The current Air Quality Index (AQI) in Herndon is 30 (Good). PM2.5 concentration is 7.3 µg/m³.

What is the temperature in Herndon right now?

The current temperature in Herndon is 25.7°C (feels like 25.7°C). Humidity is 58.5% and wind speed is 25.2 km/h.

Is it safe to go outside in Herndon?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 6.9 (High).

Air Quality in Herndon, United States

Partly Cloudy

25.7°C · 58.5% humidity

25.7°

Feels 25.7°

Good

Air quality is satisfactory. Enjoy outdoor activities.

2 stations

Nearby Monitoring Stations

AQI Forecast

25 2pm

30 5pm

27 8pm

27 11pm

27 2am

25 5am

27 8am

25 11am

Air Quality Index Trend

48h · 3 stn

View full history →

Herndon's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

58.5%

Humidity

25.2 km/h

Wind ESE

1013.5 hPa

Pressure

6.9

UV High

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

7.3 µg/m³

PM10

27.45 µg/m³

050100150200300500

What is the weather forecast for Herndon?

Temperature & Precipitation

PM2.5 Trend

48h · 3 stations

PM2.57.3 µg/m³ ✓ WHO

Good

PM1027.45 µg/m³

Good

UV INDEX6.9

High

Station readings (2 stations within 25 km)

7.3

Median

7.3

Average

7.2

Low

7.4

High

PM2.5 µg/m³ · Model: 12.85 · Bias: +5.6

What is the 7-day forecast for Herndon?

07-21

29.8° 21.6°

0.06 mm

07-22

29.3° 20.5°

07-23

30.1° 18.1°

3.69 mm

07-24

26.0° 17.1°

0.25 mm

07-25

22.1° 20.4°

8.75 mm

07-26

28.4° 19.2°

6.13 mm

07-27

25.0° 22.3°

0.31 mm

Both models agree Avg diff: 3.6°C

Where are air quality stations near Herndon?

Ashburn - Broad Run High School, Northern Virginia, USA

10.8 km PM2.5: 10.1 µg/m³

Long Park - Haymarket, Northern Virginia, USA

25.1 km PM2.5: 5.0 µg/m³

Lee District Park - Fairfax County, Northern Virginia, USA

32.7 km PM2.5: 6.7 µg/m³

What cities are near Herndon?

31 Reston 30 Oak Hill 30 Sterling 38 Great Falls 30 Chantilly 36 Wolf Trap 30 South Riding 30 Ashburn 33 Oakton 35 Vienna

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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 2026-07-21T21:52 UTC.