CBS News Travel Peter Greenberg has a new list of the most unhealthy air. PHOTO: Sunset aerial view of historic downtown Bakersfield, California (Getty Images)<a href="https://www.gettyimages.com/license/636712363?phrase=Bakersfield%20California&adppopup=true"></a>

CBS News Travel Peter Greenberg has a new list of the most unhealthy air. PHOTO: Sunset aerial view of historic downtown Bakersfield, California (Getty Images)

CBS News Travel Peter Greenberg has a new list of the most unhealthy air. PHOTO: Sunset aerial view of historic downtown Bakersfield, California (Getty Images)<a href="https://www.gettyimages.com/license/636712363?phrase=Bakersfield%20California&amp;adppopup=true" rel="noopener noreferrer"></a>

US regions with the most polluted air

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US regions with the most polluted air

US regions with the most polluted air