Here is a side by side comparison of a view out of my window last July, and a view out of my window today. Granted, it is a little cloudy today, but I can't even tell where the clouds begin and the smog end.
If you don't believe me, here is another picture from Olympic park yesterday. I was trying to get a view of the gate from the hill, but you can barely see it it's so smoggy. This is far from downtown too. Oh, and it was NOT cloudy yesterday.