fog
maybe a little less of it will do though, it is a tad to much, but i've seen it look like that after a very hot day and then extremely cold rain, steam will pour out of the asphalt and it can look like that
or.. better yet, it looked almost exactly like that the other morning when it was raining on the way to school and still extremely foggy (area near my school gets reeeeally foggy, but i still haven't figured out why that is [aren't any rivers near it, no lakes, no mountains or valleys or anything..])