Researchers must find the particles that are most dangerous to health in each place so policies can reduce levels of those pollutants first, urge Xiangdong Li and colleagues. Researchers must find the particles that are most dangerous to health in each place so policies can reduce levels of those pollutants first, urge Xiangdong Li and colleagues.

中文翻译：

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空气污染：全球性问题需要本地解决

李向东及其同事敦促研究人员必须在每个地方找到对健康最危险的颗粒，以便政策可以首先降低这些污染物的水平。李向东及其同事敦促研究人员必须在每个地方找到对健康最危险的颗粒，以便政策可以首先降低这些污染物的水平。