“Although Delhi’s (and India’s) air has gotten progressively worse – a 2014 report said air quality in the country has declined 100 percent in the last decade – contributions from different pollutants have shifted over the years.
What’s changed?” Hindustan Times
Read it on Delhiair.org: A history of Delhi’s air pollution: Can road rationing even the odds?
delhiair.org - be informed and active about air quality in New Delhi, India 