Fig. 1From: Vertical distribution characteristics and potential sources of atmospheric pollutants in the North China Plain basing on the MAX-DOAS measurementRelative geographic location of observation sites [subfigure a shows the location of Shijiazhuang City in China, subfigure b shows the location of the sites relative to the North China Plain, and subfigure c shows the location of Shijiazhuang City, where the Hebei Provincial Weather Modification Office is located]Back to article page