This is what many cities in the U.S. looked like before the EPA.

Why the heck would anyone celebrate deregulating it?

@luckytran Eliminating air quality rules may also lead to more automobile accidents in the Central Valley (California) due to increased tule fog.

https://www.latimes.com/california/story/2020-01-11/what-causes-dangerous-tule-fog-in-californias-central-valley-and-why-is-it-becoming-less-common

Tule fog: Dangerous, desired, decreasing in California's Central Valley

We take a look at the source of dense tule fog and the factors that are causing people in California's great Central Valley to see a little less of it.

Los Angeles Times