. 2016 Jul 18;4:143. doi: 10.3389/fpubh.2016.00143
Copyright © 2016 Liu, Yang, Liu, Wang, Welles, Márquez, Frank and Haas for Drexel (US) – SARI (China) Co-Research and Education on Low Carbon and Healthy City Technology Study Group.
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Figure 1.
Daily (A) and weekly (B) trend in air pollution index in 120 cities of China in 2012 and 2013, China.