Dow Chemical on Wednesday was ordered to clean up dioxin in homes and yards downstream of its Michigan headquarters, the result of dumping dioxin-laden chemicals in nearby rivers for decades. Test results revealed yesterday show dioxin levels in and around a number of houses some 20 miles downstream exceed by a few times the level considered reasonably safe by the U.S. EPA. Dioxin levels in the tainted yards averaged twice the safe limit; one yard sample was found to exceed safe levels by some 23 times. Dioxin is carcinogenic and extremely toxic, though Dow contends dioxin-laced soil doesn't threaten people …
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