A few years ago a cisterna truck full of styrene crushed on the road near a small town nearby, spilling 4 tons of the chemical. It apparently has caused a small ecological catastrophe killing fish in the local river with concentrations of 3.7 ml/l in the water, and half of the population - some 2000 people were evacuated in the next 2 days, but it was not mandatory, and what seems more strange to me, I've seen all the firefighters not wearing any gas masks while pouring some white foam on the truck. Also, no one mentioned that styrene is a cancerogen.
Initially, there was no info on the chemical spilled, and I didn't know or care much then, but today I incidentally found out it was styrene, and I got curious. So, were those measures somehow inadequate, or on the contrary - far-fetched, and just how bad this is?