How do you deal with the people working in those places.
Because you will always have people in really bad financial situation that they would take any kind of job, so because they are poor, they should increase their potential for getting a cancer that they would be able to pay for.
That is not a way a civilized society should treat its people.
If you think that's fair you'll have more jobs accidents, and people sick, because in my company, I don't want my workers to use any kind of protection to clean those chlorine (choose your favorite chemical) tanks. And you'll always find people too desparate that will do it for there kids to go to school.
This is what happens in undevelopped countries, and I'm not sure it's something you want to happen here.