The toxic air of Delhi is taking away more than 10 years from the life of an average resident who is exposed to it for a sustained period, according to a new index released by a US university on Monday.

The Air Quality Life Index (AQLI) developed by the University of Chicago’s Milton Friedman Professor in Economics, Michael Greenstone, and his team at the university’s Energy Policy Institute (EPIC), calculates the effect of air quality on life expectancy….