[lookingforsome]

yeah air quality is terrible in Los Angeles when I visited there.

[byw]

Is it mostly automobiles? Does it get better outside the cities?

[jeffbee]

Outside the biggest cities it's actually worse. For particulate pollution you need that special mix of cars, off-road equipment, smoke, and dust. Like Fresno. https://www.lung.org/research/sota/city-rankings/states/cali...