Is it true that asthma cases in children often correlate to living close to roads and all the associated pollution-spewing traffic? To wit, a recent study by the University of Southern California USC —the most comprehensive by far to date on this topic—found that at least eight percent of the more thancases of childhood asthma in Los Angeles County can be attributed to traffic-related pollution at homes within feet of a busy roadway. The findings, released in the September online edition of the peer-reviewed journal, Environmental Health Perspectives, indicate that previous research underestimated the effects of roadway traffic on asthma. Some of the policies designed to reduce traffic congestion and car usage include offering housing developers incentives to locate projects closer to transit stops, thus encouraging use of public transit.
In particular, the acidic gas nitrogen dioxide has been shown to decrease ciliary function and increase the response of asthmatics to allergens; and inhalation of diesel exhaust particles has been shown to cause immune changes in mice.
Conflicting Evidence Collected The potential link between asthma and road traffic pollution has been extensively studied, but research has yielded conflicting reports.
For example, a British study based on routine hospital admissions found no association between hospital admissions for asthma and exposure to traffic pollution. When investigating the potential for traffic pollution to cause asthma, it is important to consider a number of factors including the severity of the condition.
It is quite possible that traffic pollution exposure could cause an increase in the number of children suffering from mild asthma without significantly affecting asthma hospital admissions: Nitrogen Dioxide Affects Respiratory Health A Californian study published in examined possible associations between exposure to traffic pollution and childhood asthma.
The study found children exposed to higher levels of traffic pollution were significantly more likely to suffer from asthma. Early Exposure May be Significant Scientists in France conducted a case-control study in five urban areas between and Having adjusted the results to allow for confounding factors such as exposure to tobacco smoke, the researchers found there was no association between lifelong exposure to traffic and asthma.
However, the study found there was a significant association between exposure to traffic in the first three years of life and the development of asthma.
This suggests the very early years of life may be critical in the development of sensitivity to respiratory conditions, and that limiting exposure to air pollution during these years may help prevent the onset of asthma. Does Traffic Pollution Cause Asthma? It is well established that traffic pollution can exacerbate the symptoms of children already suffering from asthma.
Further studies and meta-analyses are required to confirm any possible link between exposure to traffic pollution and the onset of asthma and other respiratory conditions.note: responding to the questions below is voluntary.
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The traffic flow could be investigated by observing traffic phenomena in real life traffic situations and understanding the traffic phenomena based on traffic flow system. It is the study of interaction between drivers, vehicles, and infrastructure. Air pollution Air pollution is the introduction of chemicals, particulate matter, or biological materials that cause harm or discomfort to humans or other living organisms, or cause damage to the natural environment or built environment, into the atmosphere.
Air Pollution in California (Coursework Sample) California's Air Pollution Causes Asthma, Allergies and Premature Births the University of Southern California who were conducting a long-term study on the link between chronic exposure to air pollution from freeway traffic and respiratory illnesses.
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Writing Tips; A cause and effect relationship means that one thing causes another one (or that one thing is the effect of another one).
(a) Route 5 south of San Juan Capistrano to Route near El Rio except for the portion of Route 1 relinquished: (1) Within the city limits of the City of Dana Point between the western edge of the San Juan Creek Bridge and Eastline Road at the city limits of the City of Laguna Beach.