Published articles about Parts Per Million.
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1. Schoolyard secrets: When it comes to kids' safety, why do we tolerate a public right not to know? - From The Los Angeles Times

2. Beverly High, Oil Wells, Power Plants, Cancer: Disproven? Not So Fast: Article by Sheila Weller for the Huffington Post website.

3. Finally, a Chance to Clear the Air at Beverly Hills High: After a year of allegations, a state official will hold hearings into possible health risks at the school.
- From The Los Angeles Times