What is the air quality in Herndon today?

The current Air Quality Index (AQI) in Herndon is 29 (Good). PM2.5 concentration is 6.97 µg/m³.

What is the temperature in Herndon right now?

The current temperature in Herndon is 27.4°C (feels like 29.0°C). Humidity is 46.0% and wind speed is 15.2 km/h.

Is it safe to go outside in Herndon?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 2.2 (Moderate).

Air Quality in Herndon, United States

Clear

27.4°C · 46.0% humidity

27.4°

Feels 29.0°

Good

Air quality is satisfactory. Enjoy outdoor activities.

Calibrated model

Nearby Monitoring Stations

AQI Forecast

25 7pm

29 10pm

25 1am

25 4am

27 7am

27 10am

25 1pm

25 4pm

Air Quality Index Trend

45h · 28 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.

46.0%

Humidity

15.2 km/h

Wind WNW

1012.3 hPa

Pressure

2.2

UV Moderate

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.97 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Herndon?

Temperature & Precipitation

PM2.5 Trend

45h · 28 stations

PM2.56.97 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX2.2

Moderate

What is the 7-day forecast for Herndon?

08-03

27.4° 20.3°

6.56 mm

08-04

37.6° 20.9°

08-05

34.7° 19.2°

1.06 mm

08-06

29.6° 21.1°

08-07

34.0° 20.2°

1.12 mm

08-08

36.6° 21.2°

1.75 mm

08-09

35.4° 21.3°

0.75 mm

Both models agree Avg diff: 3.5°C

Where are air quality stations near Herndon?

Ashburn - Broad Run High School, Northern Virginia, USA

10.8 km PM2.5: 7.4 µg/m³

Ashburn - Broad Run High School, Northern Virginia, USA

10.8 km PM2.5: 3.8 µg/m³

Ashburn - Broad Run High School, Northern Virginia, USA

10.8 km PM2.5: 9.1 µg/m³

Long Park - Haymarket, Northern Virginia, USA

25.1 km PM2.5: 3.4 µg/m³

Rockville, Maryland, USA

29.0 km PM2.5: 4.8 µg/m³

Lee District Park - Fairfax County, Northern Virginia, USA

32.7 km PM2.5: 4.8 µg/m³

What cities are near Herndon?

25 Reston 25 Oak Hill 25 Sterling 37 Great Falls 25 Chantilly 37 Wolf Trap 25 South Riding 25 Ashburn 25 Oakton 26 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 2026-08-08T02:06 UTC.