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. Author manuscript; available in PMC: 2017 Aug 24.
Published in final edited form as: J Environ Prot (Irvine, Calif). 2016 Dec 29;7(13):2081–2094. doi: 10.4236/jep.2016.713162

Figure 2.

Figure 2

Figure 2

Number of days each year exceeding current US and Chinese air quality standards and WHO guidelines.