Every morning, you glance out the window and wonder: is it safe to take the kids for a walk? Should I grab a mask? Will the dog be okay? Most air quality apps throw raw PM2.5 numbers at you and call it done — which doesn’t actually answer the question you’re asking.
Today I’m releasing Air Quality Bar, an Android app that turns PM2.5, PM10, and ozone readings into a single 0–100 score designed specifically for the person heading out — whether that’s you, your kid, your elderly parent, or your dog.
I built this because I was tired of squinting at air quality indices that assumed everyone’s body reacts the same way to pollution. They don’t. A pregnant person or elderly family member needs stricter thresholds than a healthy adult. A young kid needs different protection standards than a pet. And honestly, most mornings I just wanted one number and one color — not a dashboard of metrics.
The core insight is simple: instead of showing raw pollutant numbers, I weight PM2.5, PM10, and ozone against your chosen profile’s thresholds. At your profile’s threshold, the score hits 50 (the boundary between “go” and “stay”). Double the threshold reads as 0. So a score of 75 on your kid profile intuitively means “light activity is fine,” while the same score on your pregnant profile might mean “stay inside today.”
What it does
- Five family profiles — Adult, Kid, Pregnant, Elderly, and Pet. Switch with one tap. Each has its own thresholds tuned to different sensitivity levels.
- Intuitive 0–100 scoring — Paired with a four-step color band (Good / Moderate / Bad / Very Bad) so you can read the air quality at a glance, even from a notification.
- Persistent colored notifications — Your notification tray shows the current score’s color all day, refreshing hourly. No need to open the app.
- Hourly trends and tomorrow’s forecast — See whether the air is getting cleaner or worse, and when tomorrow’s best window for outdoor time might be.
- Threshold alerts — Set a PM2.5 threshold and get a push notification when it’s crossed, so you don’t have to check before heading out.
- Automatic station matching — Allow location once, and the app finds your nearest air-quality station. Want to check another city? Search and pin any station by name.
The app runs on data from the World Air Quality Index (WAQI) project, a global network of air-quality monitoring stations. That means Air Quality Bar works whether you’re at home or traveling internationally.
Privacy matters to me. There’s no sign-up required. Your profiles, thresholds, and pinned stations live entirely on your device. Location is used only to find the nearest station and is never stored or shared.
Who this is for: Anyone who steps outside and wants a fast, intuitive answer to “is it okay to go out right now?” — whether you’re deciding for yourself, your children, your aging parents, or your pets. If you’ve ever stood at the window wondering whether to grab a mask, or checked an air quality app only to be confused by the numbers, this app is built for that moment.
Air Quality Bar is available now on Google Play. Download it free and try it with whichever family profile fits your needs today.
Play Store에서 다운로드: Air Quality Bar: Outdoor Score
Official page: reactiveworks.dev/apps/dustalert
Update history: ahngo13.github.io
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