When I went out yesterday afternoon it was extremely windy. When I look back it was right around 100 then and was the low of the day.
Wind definitely effects the readings, but whether the pollution actually blows away or if it just skews the readings I am not sure.
Also, anyone see NASA’s comparison photos of a good and bad air day recently? http://earthobservatory.nasa.gov/IOTD/view.php?id=80152