Exposure to common toxic substances could increase asthma symptoms

Vienna, Austria: Children who are exposed to polychlorinated biphenyls (PCBs), which were commonly used in a range of industrial products,  could be at risk of an increase in asthma symptoms, according to new research.

Read more at: http://medicalxpress.com/news/2012-09-exposure-common-toxic-substances-asthma.html#jCp