Aqi rankings: Discover real-time top 100 most

Discover real-time top 100 most polluted cities worldwide with AQI Ranking 2025. Stay informed on global air quality at a glance. Check the full worldwide EPA list page. The AQI scale used for indexing the real-time pollution in the above map is based on the latest US EPA standard, using the Instant Cast reporting formula. Our GAIA air quality monitors are very easy to set up: You only need a WIFI access point and a USB compatible power supply. Once connected, your real time air pollution levels are instantaneously available on the maps and through the API. Our GAIA air quality monitors are very easy to set up: You only need a WIFI access point and a USB compatible power supply. Once connected, your real time air pollution levels are instantaneously available on the maps and through the API. The station comes with a 10-meter water-proof power cable, a USB power supply, mounting equipment and an optional solar panel.