Dust fallout on Lake Mendota

For dust, Madison's air ranks as the 24th most polluted, out of 277 cities.

Last Saturday during a thaw, I could see dust fallout on the surface of Lake Mendota.  The Lake has been ice-covered for only a few weeks, so you can see how rapidly dust accumulates.

The dust floated on meltwater, and blew into a row along the edge of this icy pool.

Early next spring, this surface dust will become water pollution.

One of the largest contributors to dirty air is construction in Madison--our largest industry.