We already know that exposure to ozone, a major component of urban air pollution, increases cardiovascular and pulmonary hospitalizations, and deaths. Now Duke University Medical Center finds that inhaled pollutants impair the immune system, making mice, at least, more susceptible to subsequent foreign invaders, such as bacteria. This just as the Environmental Protection Agency is reviewing the standards for levels of ozone in the air. The current standard is 85 parts per billion. Many medical groups, including the American Thoracic Society, recommend a stricter standard of 60 parts per billion.
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