After several years of preparatory work, EPA is expected to announce by June 26, 2009, its proposed primary standard for one of the six "criteria" air pollutants, nitrogen dioxide.
By CHERYL HOGUE
The so-called Teflon chemical continues to make headlines. This synthetic compound, known as PFOA (short for perfluorooctanoic acid) or C8, is found in the blood of most people around the world, including you and your audience. But just where this chemical is coming from remains an open question.
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