Friday, June 13, 2008

Traffic and Road Pollution Pushing Children into Allergies, Asthma

The closer your children live to roads, the higher their risk of developing allergies and asthma. New evidence blames traffic-related pollution for increasing these risks among children by more than fifty percent.

“Children living very close to a major road are likely to be exposed not only to a higher amount of traffic-derived particles and gases but also to a more freshly emitted aerosols which may be toxic,” wrote lead author of the research, Dr. Joachim Heinrich, of the German Research Center for Environment and Health at the Institute of Epidemiology, in Munich.

“Our findings provide strong evidence for the adverse effects of traffic-related air pollutants on atopic diseases as well as on allergic sensitization,” wrote Dr. Heinrich.

The results appeared in the second issue for June of the American Thoracic Society’s American Journal of Respiratory and Critical Care Medicine. The study examined nearly 2,900 children at age four and more than 3,000 at age six to determine their rates of doctor-diagnosed asthma and/or allergy with relation to long-term exposure to traffic-related pollution. Their exposure to traffic pollutants was calculated as a function of the distance of their homes from major roads at birth and at two, three and six years of age. Parents were given questionnaires about their child’s respiratory diagnoses and symptoms, and their children were assessed for asthma, wheezing, sneezing and eczema.

Researchers found significant positive associations between distance to the nearest road and asthmatic bronchitis, hay fever, eczema and allergic sensitizations. They also found a distant-dependent relationship between proximity to the road and risk of allergic sensitization, with those living closest to major roads having a nearly 50 percent greater risk of allergic sensitization.

“We consistently found strong associations between the distance to the nearest main road and the allergic disease outcomes,” wrote Dr. Heinrich. “Children living closer than 50 meters to a busy street had the highest probability of getting allergic symptoms, compared to children living further away.”


1 comment:

Juhana Harju said...

The Lohasian blog refered a recent study last month: "A new Columbia University study suggests that children living on tree lined streets have lower rates of asthma. The researchers found that asthma in kids aged four or five fell by 25% for every 343 trees per square kilometer."