How clean is the electricity you use?

How clean is the electricity you use? here is a great website (US Environmental Protection Agency) if you live in the US, just type your zip code and it compare the sources of electricity in your region compared to the national average: http://www.epa.gov/cleanenergy/energy-and-you/how-clean.html ... also this website is a great resource for coal-fired power plant emissions including an article discussing the radioactive pollution (http://www.ornl.gov/info/ornlreview/rev26-34/text/colmain.html) as well as other toxic substances released by burning of coal: http://www.epa.gov/radtown/coal-plant.html ...if you live in Ontario, this website gives a live account of where Ontario's electricity come from (at this moment 9:04am Sept. 18, 2011 it is 76% nuclear): http://media.cns-snc.ca/ontarioelectricity/ontarioelectricity.html