Finding F-1281

“The indoor average concentrations of sulfur dioxide, nitrogen dioxide, ozone, and formaldehyde by class were 264.8, 39.4, 10.1, and 2.3 μg/m3, respectively.”

Lotz Asthmatic Symptoms among Pupils in Relation to Winter Indoor and Outdoor Air Pollution in Schools in Taiyuan, China (2008). Environmental health perspectives. Page 1. CKB 6640

Structure

Factor: Nitrogen dioxide (NO₂)
Population: pupils aged 11 to 15
Setting: classroom, CN (winter)
Study design: cross-sectional study in a coal-burning city in northern China: a questionnaire on respiratory health and home environment was answered by 1,993 pupils aged 11 to 15 in ten urban schools of Taiyuan, and indoor and outdoor air pollutants and climate factors were measured in the same schools in winter (class 4)
Effect: mean 39.4
Caveat: a winter measurement in a coal-burning city, averaged over the classes

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