Air pollution can cause a wide range of adverse health effects, including COPD, asthma, low birth weight, cancer, cardiovascular disease and an increased risk of premature death. A new study from the University of Copenhagen, Danish Pediatric Asthma Center and Herlev and Gentofte Hospital shows that even small differences in exposure to air pollution during pregnancy and the first years of life are associated with poorer lung function in children and adolescents.