"You would feel eye irritation first before reaching any damaging threshold. You haven't been dosed with hydrogen sulfide," Recluse responded in an almost complete deadpan. That was only deadly past a threshold that also eliminated most sense of the actual danger, leading to a rather interesting series of events where those exposed didn't realize there was any problem beyond eye damage. Then they collapsed, leading either to pulmonary edema or fairly immediate death with loss of breathing.

But Scourge didn't need to know that.