The primary sources of benzene, toluene, and xylenes (BTX) are refinery streams, especially from catalytic reforming and cracking, and pyrolysis gasoline from steam cracking and from coal liquids. BTX ...

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He says these VOCs include benzene, formaldehyde, toluene, and xylene. UMass Amherst Environmental Health and Safety states that the majority of plug-in air fresheners are associated with elevated ...