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. 2014 Apr;33(4):189–196. doi: 10.5732/cjc.014.10028

Figure 1. The national annual levels of respirable particulate matter (PM10), sulfur dioxide (SO2), and nitrogen dioxide (NO2) in China, 2003-2012.

Figure 1.

Data source: China Statistic Yearbook 2004-2013. The national levels are averaged from the annual levels of 31 provincial cities in China. The dotted line indicates the annual level of the Chinese National Ambient Air Quality Standard (NAAQS) Class II.