# **Today's Air Quality** - Herndon, 20170, Virginia

63

Moderate

Air quality is acceptable; however, for some pollutants there may be a moderate health concern for a very small number of people who are unusually sensitive to air pollution.

### Primary Pollutant:

PM2.5 (Particulate matter less than 2.5 microns)

| Pollutant | AQI | Category | Concentration |
|-----------|-----|----------|---------------|
| PM2.5    | 63  | Moderate | 18.19 µg/m3   |
| CO       | 3   | Good     | 363.33 µg/m3  |
| NO2      | 4   | Good     | 7.64 µg/m3    |
| O3       | 37  | Good     | 77.15 µg/m3   |
| PM10     | 19  | Good     | 21.51 µg/m3   |
| SO2      | 1   | Good     | 1.16 µg/m3    |

## Breathing

[**Northwest wildfires drop air quality, raise health risks in Oregon, Washington, Idaho**](/content/2026/07/30/health/breathing/air-quality-alerts-of-northwest-fire-weather/index.html)

[**One Simple Way To Protect Your Lungs This Smoky Summer**](/content/2025/06/04/health/breathing/video/one-simple-way-to-protect-your-lungs-this-smoky-summer/index.html)

[**This $65 DIY air filter builds in just 15 minutes**](/content/2026/07/14/health/breathing/video/diy-air-filter-for-dollar-65-and-15-minutes-wildfire-smoke/index.html)

[**What To Do To Protect Your Lungs From Wildfire Smoke**](/content/2025/04/23/health/breathing/video/what-to-do-to-protect-your-lungs-from-wildfire-smoke/index.html)

## Keeping You Healthy

[**When you can open your windows in wildfire smoke events**](/content/2026/08/14/news/weather/video/smoke-air-quality-when-to-open-windows/index.html)

[**You’re taking the wrong allergy pill for wildfire smoke**](/content/2026/08/07/health/breathing/video/does-allergy-medicine-work-wildfire-smoke-benadryl/index.html)

[**Sunscreen tips, directly from a dermatologist**](/content/2026/07/31/health/skin-health/video/best-sunscreen-tips-from-a-dermatologist/index.html)

[**It’s not just your shoes; the weather hurts your toenails**](/content/2026/07/21/health/video/how-weather-can-hurt-your-toenails/index.html)