For multiple reasons, the winters are the worst in Delhi, India - harsh winters, limited air movement, and restraining meteorological conditions worsen the already topped out air pollution problem.

For a naive and non-scientist, it would be obvious that the liquefied petroleum gas (LPG) is a clean fuel. Especially in the cities, it is the most common fuel for domestic cooking. There is also a small fraction of light duty vehicles which run on LPG and has proven to be clean compared to their counter parts - diesel and petrol.

An advanced notification system on daily air quality is developed for the National Capital Region (NCR) of Delhi, under the "Clean Air for Delhi 2010 and Beyond" program.