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After we consider air pollution, we often consider smoke pouring out of smokestacks and the unsightly brown haze that hangs over lots of the world's cities, from Los Angeles to Beijing. But in recent years, scientists have found increasing proof of well being dangers from part of air pollution that we don't see, and that isn't but regulated beneath federal air quality requirements. Along with seen emissions, the burning of fossil fuels and other types of combustions create huge portions 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 automobiles, especially ones that burn diesel gas, as well as smaller gasoline-burning engines, corresponding to the ones in lawn mowers and leaf blowers. But other forms of burning - wood fires, burning leaves, secondhand smoke from cigarettes, for instance - additionally produce ultrafine particles.
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