Tracking greenhouse gases, air quality, ozone depletion, and atmospheric composition in real time across the global data network.
Greenhouse Gas Trends
Monthly mean CO₂ measured at Mauna Loa Observatory, Hawaii. The Keeling Curve has been recorded since 1958 and is the longest continuous record of atmospheric CO₂.
Atmospheric methane has risen >2.5x pre-industrial levels. Agriculture, fossil fuels, and wetlands are primary sources. 2023–2024 saw the largest annual jumps on record.
PM2.5-based AQI values for major cities. Values above 150 are considered Unhealthy. Above 300 is Hazardous.
Stratospheric ozone in Dobson Units. Antarctic ozone hole reaches seasonal maximum each September–November. Recovery trend is underway thanks to the Montreal Protocol.
Real-Time Data Feed — Top Polluted Cities
| Rank | City | Country | AQI (PM2.5) | Status | Dominant Pollutant |
|---|---|---|---|---|---|
| 1 | Lahore | Pakistan | 341 | HAZARDOUS | PM2.5 |
| 2 | Delhi | India | 287 | VERY UNHEALTHY | PM2.5 |
| 3 | Dhaka | Bangladesh | 254 | VERY UNHEALTHY | PM2.5 |
| 4 | Beijing | China | 203 | UNHEALTHY | PM10 |
| 5 | Kathmandu | Nepal | 191 | UNHEALTHY | PM2.5 |
| 6 | Jakarta | Indonesia | 156 | UNHEALTHY | O₃ |
⚡ To get live data: integrate IQAir API or OpenAQ (both free tiers available).