Smog comes (mostly) from all those cars, trucks, buses, factories, etc......... it gets worse with "air inversions" .......... L.A. ain't the only place with bad SMOG either. Denver, Phoenix, even Tucson all have SMOG issues. Likely many many more cities that I'm personally ignorant about.
I'm not sure about San Diego........ but then that's a Republican (mostly) city. Most of the Phoenix area is Repug., too, so I'm not sure where you got the connection between SMOG and Liberals.
That's kinda like claiming the Republicans are where all the bullshit exists.......... most folks with sense KNOW that's a BS claim.
Plenty of Dems spew Bullshit, too.
Just not as often as you Moy!