“总体上，我们见证了空气质量的巨大改善。”落砂机南加利福尼亚大学全球健康研究所主任Jonathan m . Samet哲学博士说。

"In general, we've seen tremendous improvement in air quality," says Jonathan M. Samet, MD, director of the Institute for Global Health at the University of Southern California, in Los Angeles.

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此研究由全球健康研究中心加拿大大学健康研究所支持。研究者的研究没有任何经济因素参与。

The research was funded by the Canadian Institute of Health Research through the Global Health Research Initiative. The researchers have disclosed no relevant financial relationships.

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