Research & Data
Open data for a clearer atmosphere
We publish research, datasets, and visualizations to accelerate science and policy.
Annual Air Quality Report
Trends, hotspots, and progress across 200+ cities.
Global AQI Map
Live sensor network with 24/7 open API access.
Open Datasets
CSV, JSON, and GeoTIFF downloads for researchers.
Average AQI — Major Cities
Latest 12-month average. Lower is better.
Delhi168
Beijing124
Mexico City96
Los Angeles78
London54
Tokyo45
Reykjavík18