I've been to California, after leaving LAX airport the air was almost not breathable and their were huge cars with exhaust pipes two to three times the size of that in the U.K.
Add that to the air-con, it's no wonder Michael Moore made Roger and Me where he said "you can't even see the Hollywood sign from here" all it showed was a grey disgusting smog, and L.A. stinks. This was in '89, so much for a "great" president.
I went there in 2015, btw.