Lots of chemicals: The materials used to make your sneakers, especially rubber, have strong odors because of the chemicals as well as heating/proccessing needed to mold them into shapes. Nontoxic materials actually often smell worse than toxic ones--have you ever smelled the 'skunk smell?" or rotten egges? They're nontoxic, but aweful! lead/merury i.e. Often have no odor but they are toxic. Have fun learning..
Answered 12/9/2013
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