Air Quality Map Screensaver
The Air Quality screensaver is a live world map that glows from green to deep red over major cities by their real-time air-quality index, from the key-less Open-Meteo air-quality API. It's free, runs in your browser, and ESC exits.
How the Air Quality screensaver works
The saver sends one request to Open-Meteo's free air-quality API for a built-in list of major world cities — no key required.
Each city is drawn as a glowing dot on a world map, colored along the standard AQI scale from green through yellow, orange and red to purple.
Dot size grows with the index, and the worst few cities pulse and are labelled so hotspots are obvious.
The data refreshes every few minutes so the map tracks changing pollution through the day.
A worked example
The map breathes with color — a calm green dot over one city, a pulsing red one over another mid-smog event — with the worst few labelled and a small legend mapping colors to AQI bands. Switch to the European index to see the same cities on Europe's scale.
Settings & tips
- Index switches between the US AQI and the European AQI scales.
- Refresh sets how often the readings update.
- Background sets the map backdrop.
Frequently asked questions
- Is the air-quality data live?
- Yes. Every city's index comes live from the Open-Meteo air-quality API and refreshes every few minutes while it runs.
- What do the colors mean?
- They follow the standard AQI bands — green is good, yellow and orange are moderate, red is unhealthy, and purple is very unhealthy.
- Does it need a key?
- No. Open-Meteo's air-quality API is free and key-less; the saver only needs an internet connection.
- Which cities are shown?
- A built-in spread of major cities across every continent, so you get a worldwide picture at a glance.
- Is it free?
- Yes — free, no download, in your browser.