What is the air quality in Herndon today?

The current Air Quality Index (AQI) in Herndon is 19 (Good). PM2.5 concentration is 4.6 µg/m³.

What is the temperature in Herndon right now?

The current temperature in Herndon is 10.4°C (feels like 10.4°C). Humidity is 76.5% and wind speed is 32.8 km/h.

Is it safe to go outside in Herndon?

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

Air Quality in Herndon, United States

Cloudy

10.4°C · 76.5% humidity

10.4°

Feels 10.4°

Good

Air quality is satisfactory. Enjoy outdoor activities.

1 station

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

46h · 23 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.

76.5%

Humidity

32.8 km/h

Wind NE

1027.0 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

4.6 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Herndon?

Temperature & Precipitation

PM2.5 Trend

46h · 23 stations

PM2.54.6 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX0.0

Low

Station readings (1 station within 25 km)

4.6

Median

4.6

Average

4.6

Low

4.6

High

PM2.5 µg/m³ · Model: 6.5 · Bias: +1.9

What is the 7-day forecast for Herndon?

10-20

16.7° 5.5°

4.13 mm

10-21

25.4° 4.8°

0.06 mm

10-22

20.6° 9.1°

10-23

15.0° 3.7°

1.06 mm

10-24

16.5° 7.8°

0.06 mm

10-25

18.9° 5.8°

0.13 mm

10-26

15.5° 11.9°

17.13 mm

Both models agree Avg diff: 3.8°C

Where are air quality stations near Herndon?

Ashburn - Broad Run High School, Northern Virginia, USA

10.8 km PM2.5: 4.8 µg/m³

Ashburn - Broad Run High School, Northern Virginia, USA

10.8 km PM2.5: 4.3 µg/m³

Ashburn - Broad Run High School, Northern Virginia, USA

10.8 km PM2.5: 4.3 µg/m³

Long Park - Haymarket, Northern Virginia, USA

25.1 km PM2.5: 4.3 µg/m³

Long Park - Haymarket, Northern Virginia, USA

25.1 km PM2.5: 4.6 µg/m³

Long Park - Haymarket, Northern Virginia, USA

25.1 km PM2.5: 4.3 µg/m³

Rockville, Maryland, USA

29.0 km PM2.5: 8.9 µg/m³

Lee District Park - Fairfax County, Northern Virginia, USA

32.7 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?

20 Reston 19 Oak Hill 19 Sterling 23 Great Falls 19 Chantilly 21 Wolf Trap 19 South Riding 19 Ashburn 20 Oakton 20 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 2026-10-20T22:41 UTC.