ScienceDaily (May 1, 2011) — Exposure to the chemical bisphenol A during early pregnancy may be associated with wheezing in children, according to a Penn State College of Medicine researcher. Bisphenol A, or BPA is a chemical found in many consumer products, including plastic water bottles and food containers. It is present in more than 90 percent of the U.S. population, suggesting widespread exposure. Experimental research suggests that prenatal BPA exposure causes asthma in mice, but no data exists for humans.