You check the air quality index on your phone and see PM2.5 at 45 micrograms per cubic meter. Is that bad enough to skip your walk? Should you make your kids wear masks? The numbers alone don’t tell you much.
I built this app because I found myself constantly second-guessing whether it was safe to go outside. The raw pollution data didn’t translate into a decision. I wanted something that would give me one number—a simple score—that I could understand at a glance.
What It Does
- Converts pollution into a single outdoor score. Instead of juggling PM2.5, PM10, and ozone readings, the app weighs all three pollutants together and gives you a 0–100 score. Hit the threshold? You’re at 50 (the go/no-go line). Double the threshold? You’re at 0. It’s designed to feel intuitive: “Today’s a 70, so a quick trip should be fine.”
- Tailors the score to your family. Not everyone responds to air pollution the same way. The app includes five profiles—adults, children, pregnant women, elderly/immunocompromised people, and pets—each with its own sensitivity thresholds. Switch profiles with a single tap on the home screen.
- Shows hourly trends and tomorrow’s forecast. See how PM2.5 and PM10 have moved throughout the day in a simple graph. If a forecast is available, the app suggests the best times to go outside—”late afternoon looks clearest.”
- Sends alerts when thresholds are crossed. Set your PM2.5 limit once, and you’ll get a push notification if it’s breached. No need to check the app again before heading out.
- Auto-detects your location. Turn on GPS once, and the app finds the nearest air quality monitoring station. You can also manually search for data from other cities if you’re traveling.
The app pulls data from the World Air Quality Index (WAQI) project, so it works the same way whether you’re checking air quality in Seoul, London, or New York. Color coding—good, fair, poor, very poor—sits right next to the score so you never have to read the number twice.
Privacy matters here. There’s no sign-up, no account, no data sent anywhere. Your family profiles, threshold settings, and favorite monitoring stations all stay on your device. Location is only used to find the nearest station and is never stored.
Who It’s For
This app is built for anyone who lives or travels in areas where air pollution is a real consideration—particularly in Korea, where seasonal air quality swings can be dramatic. If you’re a parent trying to keep kids safe outdoors, someone with respiratory sensitivity, or just tired of squinting at index numbers, this gives you the clarity you need. The family profiles mean it works whether you’re managing a household with children, elderly relatives, or pets.
The app is available now on the App Store. Give it a try and see if one simple score makes your daily outdoor decision easier.
App Store에서 다운로드: 미세먼지 알리미 – 외출 점수
Official page: reactiveworks.dev/apps/6771139805
Update history: ahngo13.github.io
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