Fig. 2: Spatial distribution of the yearly averaged tropospheric HCHO VCD in Tibet from 2013 to 2021.

The yearly averaged tropospheric HCHO VCD in Tibet for each year. The labels of the rectangles and marks are the same as those in Fig. 1.

The yearly averaged tropospheric HCHO VCD in Tibet for each year. The labels of the rectangles and marks are the same as those in Fig. 1.