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What you can't see...can hurt you. I'm Lindsay Liepman with the latest health news. A new
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study found that ultrafine particles in polluted air may be tied to heart disease. Ultrafine
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particles are generated by gas and diesel engines. They also come from biomass burning
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like forest fires and energy production.This was the first study to look at the health
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effects of being exposed to ultrafine particles over a long period of time. The information
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will help environmentalists help protect public health.
