Two-stroke scooters are a dominant source of air pollution in many cities
Two-stroke scooters are a dominant source of air pollution in many cities
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DOI：
10.1038/ncomms4749
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发表时间：
2014-05-01
影响因子：
16.6
通讯作者：
Prevot, A. S. H.
中科院分区：
文献类型：
--
作者：
Platt, S. M.;El Haddad, I.;Prevot, A. S. H.
化石燃料驱动的车辆排放大量的颗粒物质，例如炭黑和初级有机气溶胶，并产生次级有机气溶胶。在这里，我们量化二冲程踏板车的二次有机气溶胶生产。汽车和卡车，特别是柴油车，被认为是主要的车辆污染源。这需要重新思考，因为我们表明，颗粒物水平升高可能是二冲程踏板车的“不对称污染”的结果，这些车辆构成了车队的一小部分，但可以通过有机气溶胶和芳香族排放因子来主导城市车辆污染，其排放因子比其他车辆高出数千倍。此外，我们表明，氧化过程中产生的二次有机气溶胶从汽车尾气也形成潜在的有毒的“活性氧物种”。
Fossil fuel-powered vehicles emit significant particulate matter, for example, black carbon and primary organic aerosol, and produce secondary organic aerosol. Here we quantify secondary organic aerosol production from two-stroke scooters. Cars and trucks, particularly diesel vehicles, are thought to be the main vehicular pollution sources. This needs re-thinking, as we show that elevated particulate matter levels can be a consequence of 'asymmetric pollution' from two-stroke scooters, vehicles that constitute a small fraction of the fleet, but can dominate urban vehicular pollution through organic aerosol and aromatic emission factors up to thousands of times higher than from other vehicle classes. Further, we demonstrate that oxidation processes producing secondary organic aerosol from vehicle exhaust also form potentially toxic 'reactive oxygen species'.