This picture was sent in by our friends at Environment Hamilton, their comment was "why would they be moving salt around on such a blustery day?" This photo was taken on November 17th.
Yesterday I came out to a to see all the vehicles on my street covered in a layer of salt, I checked a few streets over and it was the same. Even cars on the lakeside were covered this time, so it was much more widespread than in the past.
This car is located three streets to the north.
The culprit, the same salt pile that EH photographed;
Wind direction data from November 19th.