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首页> 美国政府科技报告 >Current Understanding of Ultra Fine Particulate Matter Emitted From Mobile Sources
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Current Understanding of Ultra Fine Particulate Matter Emitted From Mobile Sources

机译：目前对移动源发出的超细颗粒物的认识

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Ultra-fine particulate matter (UFPM) includes those particles that are less than 100 nm in diameter (or, for non-spherical particles, a characteristic dimension). There is currently some concern that UFPM may lead to adverse health effects in humans such as lung function decrease and cardio-vascular diseases. UFPM can be formed by nucleation of gases (e.g., sulfuric acid, some organic compounds) in the ambient atmosphere or by nucleation and condensation of gases during an emission process. Nucleation is the formation of a new particle from gaseous molecules; condensation is the transfer of a molecule from the gas phase to an existing particle. This review addresses UFPM associated with mobile source emissions. More emphasis is given to diesel engines than to spark-ignition engines because there are considerably more research results available for the former than the latter.

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