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. 2014 Jul 8;48(15):8456–8464. doi: 10.1021/es502201s

Figure 1.

Figure 1

Villages selected for the exposure survey and coal mines in Xuanwei and Fuyuan counties. Classification of coal regions based on the State Standard of China Coal Classification (GB5751–86); 1/3 coking, coking, gas fat, and meager lean coals are subtypes of smoky coal.