Even accounting for the new analysis, natural gas-which also emits less toxic and particulate pollution-offers a significant environmental advantage.

即便如此，天然气仍然以有毒物质少、颗粒污染物少的特征而具备显著的环境优势。

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The smoky stoves that many of them use, the World Health Organisation reckons, produce particulate pollution that causes around 2m premature deaths a year.

世界卫生组织估计，他们当中许多人使用的炉子会产生很多烟，其中的微粒污染物每年都会导致近200万人提前死亡。

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Research in Mexico City suggested that secondary aerosols made up two-thirds of particulate pollution, but earlier studies in Los Angeles showed the reverse, Jimenez says.

Jimenez说在墨西哥城进行的研究显示次生气溶胶占颗粒物污染的三分之二，但早些时候在洛杉矶的研究结果与之相反。

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Coal particulate pollution, on the other hand, kills fewer than 13, 000 people per year.

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This interacts with the NOX and SOX to produce the dangerously small particulate pollution that leads to premature deaths.

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"Particulate pollution reflect incoming sunlight and make clouds brighter, " said research team-member Dr Paul Halloran from the UK Met Office Hadley Centre.

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