Even if the EPA says the soil, air and water are in tolerable levels that may not mean a whole lot. There are tolerable levels for everything. I didn't even know the EPA allowed certain levels of lead in baby food until recently. I wouldn't doubt there will be reasonably higher levels of cancer in that area especially ground zero.

Any chemicals or pollution released in the air goes to everyone...globally...eventually. Its called dispersion (I think). Supposedly, you can take a deep breath and breathe the same air molecules that George Washington breathed.