Two cities joined New Delhi to be among the world's worst 10 for pollution on Monday morning, with smoke heavy in the air a day after revellers let loose with firecrackers for Deepavali.
The national capital New Delhi took, as it often does, the top spot. It had an air quality index (AQI) figure of 420, putting it the 'hazardous' category, according to Swiss group IQAir.
But it was also joined in the top 10 by Kolkata, which came in fourth with an AQI of 196, while the financial capital of Mumbai was eighth with an AQI of 163.