The Air Quality Index (AQI) map from aqicn.org visualizes real-time air pollution data across continents. It displays current PM2.5 levels and historical trends for cities like Luoyang, which recently recorded a 'Very Unhealthy' reading of 277. The platform aggregates data from thousands of monitoring stations, offering a global view of environmental conditions.

This tool provides more than just raw numbers; it delivers actionable forecasts and historical data spanning over a decade. Users can search for local stations or contribute their own data using the GAIA air quality monitors, which connect via Wi-Fi. This community-driven approach aims to fill gaps in official monitoring networks.

For developers and engineers, the site offers an API for programmatic access to pollution data, enabling integration into other applications. The map itself uses OpenStreetMap as its base, showcasing a practical application of open data. The ongoing challenge remains expanding sensor coverage, especially in underrepresented regions.