The inventory of emission sources from anthropogenic pollutants can be found in this article: http://www.atmos-chem-phys.net/7/4419/2007/acp-7-4419-2007.html
Pollution impact on earth is not a constant process, it varies time to time and depend on several parameters. No doubt , India and China are very much populated and fast developing countries. But other countries also have good impact of pollution on earth by several known ways.
Dear Siddharth, we recently had an article accepted for publication in Aerosol and Air Quality Research entitled: "Improving the representation of cross-boundary transport of anthropogenic pollution in Southeast Asia using Radon-222", I'd be happy to send you a copy if it is of interest. Cheers, Scott.