Short-term exposure to high concentrations of tiny airborne particles does not hurt heart function, according to new research.
In earlier studies, people’s blood pressure spiked after even brief exposures to concentrated particulate air pollution. Taken together, the new work and previous studies suggest that the size and chemical makeup of the particles are more important indicators of health risk than the overall concentration in the air.
Scottish scientists tested 12 middle-aged men who had
previously experienced a heart attack or undergone heart surgery and 12
age-matched, healthy men. Participants from each group were randomly assigned
to sit for two hours in a chamber and breathe either filtered ambient air from
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