I work in a sulfuric acid refinery. We have H2S, SO2, SO3, N2, CO2, H2SO4 just to start.
Not good on the lungs or overall health.
Our main products are 93%, 99%, 104.5% sulfuric acid. We run 1800* furnaces with catalysis beds running 1100*. Mix the heat with cooling tower moisture and holy cow it's hot in August. I can't imagine a steel furnace heat!