Setting the stage

Just how bad was L.A. smog before the Clean Air Act?

The Los Angeles Times and the Tucker Report

It's the cars, stupid!

Denial, delay, and deception

Air pollution goes national

The catalytic converter

California gets a little help from its friends

Everything pollutes

Environmental injustice

Diesel cars and trucks

Don't mess with our cars

What cleaning up Southern California's air can teach us about climate change

Where do we go from here?