Figure 1.
Estimated global SO2 emissions 1850–2005, including combined U.S. and Canadian sources in (GgSO2 [ktonnes]).
The graph is from data in Smith et al. (2011). The authors incorporate two historic emission estimates, for the US (Gschwandtner et al., 1986) and EPA’s National Emission Inventory (NEI) for 2009, and global (Lefohn et al., 1999). FSU is the former Soviet Union bloc.
