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Eric Schultz As the deleterious effects of second-hand smoke were confirmed in the late 1980s and early 1990s, a curious thing happened: recess, that energizing elementary-school tradition, was introduced to the workday
Okada et al
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A number of other studies assessed effectiveness in terms of removing PM, but did not report CADR: The BC Centre for Disease Control (BCCDC) demonstrated that a 11 DIY air cleaner with a MERV-13 filter achieved a 75% reduction in PM less than 2.5 m in diameter (PM 5 ) from diesel exhaust in a small test chamber within roughly five minutes
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