The smog in LA is not very pretty. I'd go nuts living in a city like that where you couldn't see further than 4 miles due to man made crap in the air. Yeah, it's sick. When a good wind blows in from the coast and knocks out some of that smog, it's actually very pretty. I can't tell you how much I wish I could see what the world and it's environment looked like back in the 1700-1800's before all this crap in the air.
Mexico city is a whole different ball game. The sky has a yellow film over it. We had to stop there otw to Manzanillo. It was freakin sick. As you fly in, you can see some buildings sticking out of the top of the yellow crap. When you are on the ground, it's like three times as bad as LA. You can't see a mile in front of you due to the crap. Maybe I was there on a bad day....who knows. I would NEVER in my life want to live there or even visit in that city. Oh, and another funny thing....when we landed, people started lighting up their cig's on the plane. I was like....uh.... everyone was smoking in the airport. We got on our next plane and everyone was smoking in that plane. I was just sitting there thinking how much this sux.
This picture shows a hell of a lot cleaner sky than how I remember it.