Air Pollution Boosts Death Rates

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The higher risks of death appeared to be linked to higher air pollution levels in the previous two years before the patients died, suggesting the pollution acts quickly, Schwartz said.

In cases when pollution levels fell, the death rates returned to expected levels within two years.

Could there be some other factor besides air pollution at play?

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It's possible, Schwartz said, but studies that used different methods have shown similar results.

Dr. Norman Edelman, chief medical officer of the American Lung Association, said the new study was consistent with previous research that suggested the dangers of particulate matter. "It's a powerful study," he said, indicating "it doesn't take years and years to see an effect."

Why is this type of air pollution so hazardous to health?

"The answer is not in," Edelman said. But it appears that the particles in soot activate the immune system, which releases chemicals that harm the body. Those who are already at ill are at increased risk, he said.

More information

Learn more about air pollution from the National Safety Council (www.nsc.org ).

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