•    Over 70% of the classrooms have an average ventilation rate significantly lower than the ASHRAE Std 62.1 suggested level.
•    The particle counts and formaldehyde concentrations were found to be below the thresholds of the NIOSH and EPA standards.
•    Periodical monitoring of classroom IAQ and TC are suggested due to large seasonal variations during the school year.

In this 2-year, seasonally-repeated study, the research team surveyed the baseline conditions of indoor air quality (IAQ) and thermal conditions (TC) of 220 classrooms in the Midwestern region (Nebraska and Iowa) of the United States of America.


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