Mid 30s and clear blue sky this morning. Strange atmospheric conditions though. About 4 miles into my ride, the temperature dropped noticeably. Almost 10 degrees, according to the cyclocomputer.

Then, nowhere near a road, I had to ride through a layer of diesel fumes. I could see a layer of blue haze. Fortunately I broke out of it after about a quarter of a mile. Temperature inversion? Weird...