-- Robert Preidt
FRIDAY, Sept. 13 (HealthDay News) -- Your car ventilation
settings have a major effect on the levels of exposure to
particulate pollution while driving, according to a new study.
Particulate pollution is the black, sooty smoke produced by
diesel engines and coal-fired power plants.
In this study, researchers from the University of Southern
California (USC) measured in-vehicle particulate pollution exposure
in a wide range of car types and operating conditions.
"Short of driving less, putting your ventilation to 'recirculate' is the best way to reduce exposure to all types of vehicle-related particulate pollution," study senior author Scott Fruin, an assistant professor of preventive medicine at USC, said in a university news release.
"Otherwise, an hour-long commute to work or school can double your daily exposure to traffic-related particulate air pollutants," he added.
Compared to ventilation settings that bring in outside air, the
"recirculate" setting reduced in-vehicle pollution from 80 percent
of on-road levels to 20 percent for small-particle pollution and
from 70 percent to 30 percent for larger particles, the researchers
The windows of the cars were always kept closed for the study.
Keeping windows open while driving quickly raises inside pollutant
concentrations to the same levels as on-road levels, the
They also found that particulate pollution levels are lower in
newer cars, at slower speeds and when driving on arterial roads
instead of freeways. Pollution levels are five to 10 times higher
on highways than in other locations, according to the
Leaving the windows closed over 30-minute or longer drives with
several passengers raised carbon dioxide levels in the cars,
Neelakshi Hudda, a research associate in the environmental health
department at USC's Keck School of Medicine, said in the news
"Some people are sensitive to high [carbon dioxide] concentrations," Hudda said. "To prevent this, outside air should be pulled in every 10 or 15 minutes for a minute or two, especially if there are two or more people in the vehicle."
The study was published online recently in the journal
Environmental Science & Technology.
The U.S. Environmental Protection Agency has more about
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