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It depends where you are in California. In parts of SoCal 100F is pretty typical. And the air quality is bad.

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

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

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...