air pollution dispersion modeling

by Elahm
(Tehan,Iran)

I am an Environmental Engineer and I am very interested in modeing the Air Pollution ( NOX, SOX, CO,...) which is caused by the fossil fuel power plants. I know that there are many softewares like disper and screen but they are not free to download. I would be so appreciate if you provide me any information for the air pollution modelling and guide me how I can find appropriate softewares which are free to download.

Thanks,
Elham

Barry's Response - Free download: good air quality models. What? Yes, the US Environmental Protection Agency has made several regulatory models available for many years now. Look over the list at

http://www.epa.gov/scram001/dispersionindex.htm

And see the lists of models for varying purposes. In fact I don't even know what most of them are for, but I am most experienced with CALPUFF, RTDM, ISC-PRIME (under alternate models), and SCREEN3. An industrial modeller will need to use BPIP, also available here for free.

Most of them come with manuals, executables and source code for editing if you so desire. It's a playland for scientific types.