Dust on Mars

Between tours I have been conducting some research. I was asked to pull out information about Mars dust from some data I have access to. Below is a movie which shows how dust has varied in the Martian atmosphere for approximately half an earth decade.

The axes are Latitude for the x axis, and layer (or height) for the y axis. The color closely represents how much dust is present in the atmosphere for every kilogram of air. No dust or missing data is represented by blue.