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After we think of air pollution, we often think of smoke pouring out of smokestacks and the unsightly brown haze that hangs over many of the world's cities, from Los Angeles to Beijing. But in recent times, scientists have found growing proof of health dangers from a part of air pollution that we don't see, and that is not yet regulated underneath federal air high quality requirements. Along with visible emissions, the burning of fossil fuels and other varieties of combustions create huge quantities of ultrafine particles - someplace around a thousandth of the width of a human hair - that we inhale with out even realizing it. They're emitted from vehicles, particularly ones that burn diesel gasoline, in addition to smaller gasoline-burning engines, such as those in lawn mowers and leaf blowers. But different kinds of burning - wood fires, burning leaves, secondhand smoke from cigarettes, for instance - also produce ultrafine particles.
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