In many senses having an unpolluted local environment is a luxury good that many poorer communities "don't purchase" - i.e. a richer community would choose cleaner air while a poorer community would choose less restrictions on factories because they need these jobs; a richer community would implement proper wastewater treatment because they can afford to divert their resources to that infrastructure, while a poorer community would do without because they choose to spend their resources on more important things they're lacking.
That implies there are other buyers who are happy to pay money to take it, doesn't it? That doesn't seem to be happening though:
https://qz.com/117151/us-states-banned-from-exporting-their-...
I suppose some countries agree to take the trash in return for some kind of economic favor from the US?