Visibility is terrible and the air is thick with an odorless haze...I live on the river and sometimes the fog lifting will linger around for a while but I haven't seen this even when we had nearby forest fires. We have no cloud cover whatsoever...here is an image of our local radar picking up the haze in my area.

Edit: Seems to be leftovers from yesterdays Midwest dust storm...thanks to all and consider how anything airborne can make it's way across the country in hours.

[link to whnt.com]

:localradar640:

Here is this mornings MODIS image...looks like the haze is coming from Louisiana.

[link to ge.ssec.wisc.edu]

:MODIS101912: