Nearly everyone in the world breathes bad air. This is what you can do to lower your risk

Most of the world’s population is exposed to polluted air, and to those living in cities with chronically bad air, the smog might feel inescapable.

​Most of the world’s population is exposed to polluted air, and to those living in cities with chronically bad air, the smog might feel inescapable.   Most of the world’s population is exposed to polluted air, and to those living in cities with chronically bad air, the smog might feel inescapable.