Apparently, Los Angeles is no 1.
The research is referenced in the WSJ article, which is behind a paywall: wsj.com/articles/the-places-with-the-worst-air-pollution-in-america-52ae23be
The research is referenced in the WSJ article, which is behind a paywall: wsj.com/articles/the-places-with-the-worst-air-pollution-in-america-52ae23be