Dr. Green is a pediatric dentist. Most of his patients are children. Children like to come to his office. He tells them about their teeth. He cleans their teeth well. He also takes care of their toothaches and fixes their broken teeth. Then he gives them a small gift.
Dr. Green lives in Olney. That’s a small town near Washington, D.C.. But his dental office is in Washington at 1616 Jefferson Street. He gets up at 6:15 every morning. He eats break- fast at 6:45 and leaves for work at 7:15. He drives to work and keeps his car in a parking lot on Madison Street. He gets to his office at about 8:00.
Dentists earn a lot of money, and they also have a lot of responsibilities.
Children attending schools located in high-traffic zones have a 45 percent increased risk of developing asthma, even though time spent at school only accounts for about one-third of a child’s waking hours, according to new research.
Asthma is the most common chronic childhood illness in developed countries and has been linked to environmental factors such as traffic-related air pollution. "While residential traffic-related pollution has been associated with asthma, there has been little study of the effects of traffic exposure at school on new onset asthma," says Rob McConnell, professor of preventive medicine at USC’s Keck School of Medicine. "Exposure to pollution at locations other than home, especially where children spend a large portion of their day and may engage in physical activity, appears to influence asthma risk as well."
The study appears online in the journal Environmental Health Perspectives. The study drew upon data
A. there has been little study of the residential traffic-related pollution
B. activities that take place at school may increase the risk of asthma
C. traffic-related pollutant level is lower during the morning hours
D. frequent exposure to outdoors appears to influence the risk of asthma
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