Los Angeles looked like that every day for many many years, but that was when we were headed for an extinction level ICE AGE caused by our Pollution(CARBON)that miraculously changed course and turned in to Man Made Global warming and the air cleared.
Thank Congress for passing laws.
But the changes they made caused our pollution(carbon) to create out of control global warming threatening spontaneous combustion on a planetary scale and brought us out of the impending Ice Age in 2 years while the air cleared.