The US actually has fairly strong environmental regulations, like you can't legally import one of picrelated 6hp low speed farm diesel engine.
And because of it, a lot of companies prefer to locate their manufacturing in Mexico, China, or India
And even so, you still have accidents like the East Palestine Ohio train derailment.
And the big corporations that ARE operating in the US are violating environmental regulation all the time, they just pay the inspectors to look the other way.
And if you've got an honest inspector who refuses to play along, they just go to the union and tell them this big fine is going to mean they need to lay off X number of employees, and the union goes down to city hall and does some Goodfellas shit and that inspector gets reassigned elsewhere.
The only real effect of this regulation is you have no small businesses in that space, because they can't do #4 so they're unable to compete.