Environmental Change
★★★

Initiative Description: Change the time of ventilation so that high ventilation periods do not correspond to rush hour traffic at school.

Study Results: There were statistically significant (P < 0.05) reductions in concentrations of most of the pollutants measured at the two late-start (9 AM start) schools. Changing the timing of the ventilation may be a cost-effective mechanism of reducing traffic-related pollutants in late-start schools located near major roads.

Reference: MacNeill, M., Dobbin, N., St-Jean, M., Wallace, L., Marro, L., Shin, T., . . . Wheeler, A.J. (2016). Can changing the timing of outdoor air intake reduce indoor concentrations of traffic related pollutants in schools? Indoor Air, 2016(26), 687-701.

Level of Evidence: 3 out of 5 stars Very Good