I would presume that if you can't move out, perhaps they'd prescribe an air purifier.

Turns out we have devices that can control the environment to some degree.

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EDIT: I also believe that the topic of air pollution and its effects on people is an OSHA issue, not so much a medicine issue. Regulations exist to reduce the air pollution from plants (ex: why coal is so expensive these days), and workplaces (again: why coal is so expensive). We've found lower pollution sources of energy, such as natural gas.