I would go for
Simulation of the wind drift, blue color, dissipation, and obscuring effect / opacity of the smoke.
Then, if you really need to mention the trees but you want to be very concise, put them in parenthesis, so that they don't get mixed up with the main phrase.
Simulation of the wind drift, blue color, dissipation, and obscuring effect (trees etc.) of the smoke.
I don't much care for tree-obscuration as a noun.
A standard measure of smoke is the Ringelmann chart. Although I frequently here people talking about opacity (I sometimes work on proposals for industrial flares) the term used in this document is simply density. http://www.cdc.gov/niosh/mining/userfiles/works/pdfs/ic8333.pdf