The California Portable Classrooms Study (PCS) was conducted to address concerns raised regarding environmental conditions in California’s portable classrooms. The objective of the study was to examine environmental health conditions, especially those related to indoor air quality and health risks, in K-12 portable classrooms in California. These environmental conditions included levels of airborne chemicals; the presence of potential pollutant sources; the performance of heating, ventilating, and air-conditioning systems; factors such as light, noise, temperature, and relative humidity; the presence of mold and other biological contaminants; and pollutant and allergen levels in floor dust. Concerns over indoor environmental quality in California’s schools have been raised by scientists, government agencies, school administrators, and environmental health groups, as the demand for classrooms resulted in increased reliance on portable classrooms. Population growth, class-size reduction programs, and fiscal limitations have driven this increase. Schools have primarily met the increased demand for classrooms by using portable classrooms because, relative to traditional classrooms, they are more economical and can be obtained more quickly. Additionally, until 1998 new schools were required to be designed to include 30 % portabl
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