Carcinogenic chemical remains in air near many schools

May 20, 2009
Carbon tetrachloride found outside 70 or 95 schools monitored by USA Today

Despite efforts to eliminate carbon tetrachloride, classified by the U.S. Environmental Protection Agency as a probable human carcinogen, it still shows up at elevated levels around the world, scientists say. USA TODAY found it outside 70 of 95 schools in 30 states it monitored for a week last fall as part of its "Smokestack Effect" series.

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