There's no smog in DC, but there's plenty of haze. "Hazy, hot, and humid" is standard summer weather there.
You can see it on a hot day out my way pretty easily -- there's several small ridges around, and they disappear into the haze. If I can't see the ridge between 202 and 30 when I go in to work, I know it's going to be viciously hot and humid!
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