Still huge, but not quite that huge
World sulfuric acid production in 2002 was about 170 million tons. From what I figure 5 tons/sec works about to about 160 million tons per year, so it's about the same as total H2SO4 industrial production today. It's also about 100 times what CFC production was at its peak in 1986.
Phillip's basic point is right, though: it's an amount on the scale of massive planetary industrialization, not a few scattered colonies.