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Figure 9 is a line graph that plots regional sulfur emissions in Gg of SO2 on the y or vertical axis, against year from 1850 to about 2010 on the x or horizontal axis. Four lines are plotted, each representing different global regions: North America, Europe, former Soviet Union (FSU) and East Asia. Three of the curves (North America, Europe and FSU) show a similar pattern, increasing to peaks of 20,000 Gg to 40,000 Gg around 1940 then decreasing towards the present. East Asia shows, on this scale, fairly small increases from zero in 1850 up to about 1950, then steeper increases for the remainder of the period covered.

 3.1 Industrial sulfates