Where could I find material on automobile emission regulations?
To find articles on your topic, I suggest searching some of the library databases that you can link to from our Environmental Studies Reseach Guide, located at http://library.uhd.edu/environmental. I found several articles that might help by searching Environment Complete and Academic Search Complete for various combinations of the following terms:
greenhouse gas mitigation
emissions (air pollution)
If you need information about the regulations themselves, you can find links to that information on the United States EPA's web site: http://www.epa.gov/oms/standards.htm.