Table 1. Pearson correlation coefficient between the U.S. Embassy PM2.5 concentration and 18 Beijing EPB PM₁₀ concentrations.

BJ-EPB Station	r	BJ-EPB Station	r
Aotizhongxin	0.81	Longquanzhen	0.82
Changpingzhen	0.72	Nongzhanguan	0.83
Dongsi	0.83	Tiantan	0.82
Fengtaihuanyuan	0.85	Tongzhouzhen	0.79
Gucheng	0.81	Wanliu	0.81
Guanyuan	0.83	Wanshouxigong	0.84
Haidingbeibuxinqu	0.69	Yizhuangkaifaqu	0.82
Huangcunzhen	0.80	Yungang	0.81
Liangxiang	0.82	Zhiwuyuan	0.77