Indoor/Outdoor Relationships for Ambient PM2.5 and Associated Pollutants Epidemiological lmplications in Lindon, Utah

摘要

Outdoor and indoor fine particulate species were mea- sured at the Lindon Elementary School in Lindon, Utah, to determine which components of ambient fine particles have strong indoor and outdoor concentration correla- tions. PM2.5 mass concentrations were measured using tapered element oscillating microbalance (TEOM); moni- tors and by gravimetric analysis of Teflon filter samples. Gas-phase HNO3' sulfur dioxide, particulate nitrate, strong acid, and particulate sulfate were measured using annu- lar denuder samplers. Soot was measured using quartz fil- ters in filter packs. Total particulate number was measured with a condensation nucleus counter (CNC). Total par- ticulate number and fine particulate sulfate and soot were correlated for ambient and indoor measurements. Indoor PM2.5 mass showed a low correlation with outdoor PM2.5 mass because of the influence of coarse material from student activities on indoor PM2.5. Fine particle acidity and the potentiation of biological oxidative mechanisms by iron were not correlated indoors and outdoors.