New Delhi's air quality has plummeted to alarming levels, with smog significantly reducing visibility and pushing the AQI above 450. Stubble burning, traffic, and industrial emissions are blamed.

Hundreds of millions of Indians breathe some of the world’s most toxic air all year round. Air pollution in the capital area that’s home to about 30 million people is especially stubborn. In winter, the cold weather actually makes the smog even worse — and potent.

Unhealthy