853405.fig.006a
(a)
853405.fig.006b
(b)
853405.fig.006c
(c)
Figure 6: Like Figure 5, but for 24 h-average PM2.5 differences (a) REF-WSR, (b) REF-WSS1, and (c) REF-WSS2 from October 1 to October 14 2008 AST.