Despite vast improvements from a decade ago, the air in Los Angeles, where I lived, and Orange County, where my family lives, will still kill ya. Fourth worst is DC, my current environ.

Nuts.

Ezra Klein is a former Prospect writer and current editor-in-chief at Vox. His work has appeared in the LA Times, The Guardian, The Washington Monthly, The New Republic, Slate, and The Columbia Journalism Review. He’s been a commentator on MSNBC, CNN, NPR, and more.