A study published in the American Journal of Respiratory and Critical Care Medicine determined that children exposed early in life to high levels of both endotoxin, a common indoor pollutant, and traffic exhaust were six times more likely to develop persistent wheezing by age 3 than children exposed to low levels of the two pollutants. Persistent wheezing in very young children can be a warning sign for asthma and other lung disorders later in life. The study is believed to be the first to look at the combined effects of traffic-related pollutants and indoor endotoxins. Endotoxin is a part of bacteria believed to trigger immune response in children. To read the complete study, visit: http://ajrccm.atsjournals.org/