Respiratory health effects of exposure to low-NOx unflued gas heaters in the classroom: a double-blind, cluster-randomized, crossover study.

Environ Health Perspect · 2010 · PMC2957932 · PMID 20663737

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highly significantno p-value reported

There were highly significant effects of heater type on concentrations of NO 2 and formaldehyde in the classrooms ( Tables 2 and 3 ).

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