Air Quality Today - AQI, PM2.5

Check the air quality today before you head out. See the current AQI, PM2.5 and ozone at the monitor nearest you.

Air Quality Today shows the official air quality index for the monitor closest to you, in the publishing agency's own categories and colors. In the United States those are the EPA AirNow categories: Good, Moderate, Unhealthy for Sensitive Groups, Unhealthy, Very Unhealthy and Hazardous. In South Korea those are the AirKorea CAI grades: Good, Moderate, Unhealthy and Very Unhealthy. The app does not recompute or re-grade the official values.

Sources (official government data; tap the links):
- United States: U.S. EPA AirNow — https://www.airnow.gov
- South Korea: AirKorea (Ministry of Environment / Korea Environment Corporation) — https://www.airkorea.or.kr and the official open-data portal https://www.data.go.kr

Today
- The official index at your nearest monitor, its category and color, and when it was measured
- Pollutant values the monitor reports (for example PM2.5, PM10 and ozone)

Forecast
- The official forecast for your area, for today and the days ahead when the agency posts it

Map
- Every monitor around you on one map, colored by category
- Tap a monitor to see its reading, or save it as your monitor

Morning notification
- Each morning at the time you pick, an air quality notification with today's category at your monitor

Home screen widget
- Your monitor's category and official index at a glance

Your location stays on your phone
- The app picks the nearest monitor on your phone. Your location is never sent anywhere
- No account, no sign-in

Official readings currently cover the United States and South Korea. Anywhere else, the app tells you there is no official monitor near you yet and shows the nearest one we cover. It never guesses.

Please note
Readings are preliminary and may change after official review. Not medical advice. Follow official air quality alerts.

Not an official government app. This app is not affiliated with, endorsed by, or a representative of the U.S. EPA, the Ministry of Environment of the Republic of Korea, or the Korea Environment Corporation.