Air pollution linked to severe mental illnesses
ecowatch.com
ecowatch.com
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.
I guaranty you, that if you are suffering mental illness in Wyoming, you will have to leave Wyoming to find a psychiatrist -- and likely would not be counted in such a study. Ergo, Wyoming is free of mental illness.