Especially in this area of California. The soil is very fine, and that car is located in prime river bottom ag land. I've seen layers of dust collect much thicker than that in a week or so during almond harvest when all the dust on the trees is shaken off.

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Garage:

2017 Chevy Colorado Diesel (nanny state emissions)
2005 Volvo S40 T5 AWD, 77k
1987 Mercedes-Benz 300D turbodiesel, 4 sp auto, 156k - 28.7 mpg
1996 Tracker 4x4, 2 door, 16v, 3 sp auto. 113k - 28.6 mpg

WARNING: this post may contain dangerous free thinking.