Below, I am compiling important sites that give you environmental information in your county or state. This will be continually updated. So please check back periodically.
EPA Envirofacts Data Warehouse - you can learn about the toxics, air, and water in your community.
National Air Quality Summary - lists current air quality conditions nationwide.
EPA's Environmental Radiation Data Nationwide - lists radiation levels in air, water and milk in selected areas of the country. Very useful.
EPA's Superfund Sites - lists superfund sites per state. Good to know if you're living near one. Very toxic sites to be aware of.