A significant Forest Service contribution to Clean Air Act objectives is provided through our Research program which focuses on the response of ecosystems and their components to air pollution including the effects of air pollution on trees and forests as well as ''acid rain'' deposition from both point sources and regional air pollution.
(A significant Forest Service contribution to Clean Air Act objectives; is provided; ) (our Research program; focuses; on the response of ecosystems and their components)
A significant Forest Service contribution to Clean Air Act objectives our Research program
is provided focuses
on the response of ecosystems and their components