What is the air quality in Herndon today?

The current Air Quality Index (AQI) in Herndon is 28 (Good). PM2.5 concentration is 6.7 µg/m³.

What is the temperature in Herndon right now?

The current temperature in Herndon is 31.6°C (feels like 36.0°C). Humidity is 54.9% and wind speed is 22.2 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

Drizzle

31.6°C · 54.9% humidity

31.6°

Feels 36.0°

Good

Air quality is satisfactory. Enjoy outdoor activities.

1 station

Nearby Monitoring Stations

AQI Forecast

25 12pm

28 3pm

25 6pm

54 9pm

34 12am

27 3am

25 6am

27 9am

Air Quality Index Trend

45h · 27 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.

54.9%

Humidity

22.2 km/h

Wind NNW

1016.5 hPa

Pressure

6.9

UV High

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲

6.7 µg/m³

PM10

13.7 µg/m³

050100150200300500

What is the weather forecast for Herndon?

Temperature & Precipitation

PM2.5 Trend

45h · 27 stations

PM2.56.7 µg/m³ ✓ WHO

Good

PM1013.7 µg/m³

Good

UV INDEX6.9

High

Station readings (1 station within 25 km)

6.7

Median

6.7

Average

6.7

Low

6.7

High

PM2.5 µg/m³ · Model: 6.25 · Bias: -0.4

What is the 7-day forecast for Herndon?

09-05

31.6° 16.2°

9.31 mm

09-06

24.8° 19.1°

4.06 mm

09-07

23.5° 16.9°

0.69 mm

09-08

30.0° 17.3°

0.69 mm

09-09

27.4° 16.1°

0.31 mm

09-10

28.3° 17.3°

3.13 mm

09-11

35.0° 14.2°

Both models agree Avg diff: 4.7°C

Where are air quality stations near Herndon?

Ashburn - Broad Run High School, Northern Virginia, USA

10.8 km PM2.5: 6.7 µg/m³

Long Park - Haymarket, Northern Virginia, USA

25.1 km PM2.5: 3.8 µg/m³

Long Park - Haymarket, Northern Virginia, USA

25.1 km PM2.5: 6.7 µg/m³

Rockville, Maryland, USA

29.0 km PM2.5: 6.2 µg/m³

Lee District Park - Fairfax County, Northern Virginia, USA

32.7 km PM2.5: 5.8 µg/m³

What cities are near Herndon?

30 Reston 28 Oak Hill 28 Sterling 31 Great Falls 28 Chantilly 31 Wolf Trap 28 South Riding 28 Ashburn 31 Oakton 32 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 2026-09-05T19:12 UTC.