Canyonlands National Park:
"An ever-dustier Western US"
There is an interesting article in the current Nature Geoscience that looks at the effect human civilization has had on dust, of all things. No, I'm not talking about Philip Pullman novels, nor accumulated skin cells, but eolian dust, generated from a number of processes including industry, wind erosion, land cultivation and so on.
http://arstechnica.com/journals/science.ars/2008/02/25/an-ever-dustier-western-us
