Environmental pollutants have a very significant impact on children with asthma. Children are more vulnerable to the effects of air pollution because their lungs don't fully form until they are adolescents. The American Academy of Pediatrics note that because children usually spend more time outdoors than adults, they have increased exposure to outdoor air pollution. Coughing, wheezing or whistling when exhaling, and shortness of breath are some of the most common symptoms of asthma in children. Ground-level ozone and fine particulate matter is found in many big cities. The Environmental Protection Agency describes ground-level ozone as the primary component of smog. It includes motor vehicle exhaust, industrial emissions, gasoline vapors and chemical solvents. Everyone should pay close attention to Air Quality reports, especially during the summer months.