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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However, there is evidence to suggest that particulate emissions from fossil-fuel powered vehicles and traffic are more toxic than a general mixture of pollutants.

但有证据表明机动车尾气中散发的颗粒物比一般污染物的混合体更具毒性。

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Most of these deaths occur in developing countries where larger amounts of harmful chemical compounds such as toxic gases and particulate matter are released in the atmosphere.

UNESCO: 2015 For Women In Science Fellows

Others are expected soon that will tighten caps on toxic metals like mercury, acid gases and particulate matter.

FORBES: OutFront