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.