Vertical travel times are about 1 month from the surface to the tropopause, and about 10 years to the stratopause. Noted damage includes decreases in fish populations as well as other biological species that are pH sensitive, and regional forest damage. They illustrate biological sensitivity to pH and US regions of low pH precipitation respectively.
Small effects are possible from direct deposition on the biomass.
The table illustrates the large extent to which forests have been damaged by acid deposition. The map illustrates regions of the US sensitive to acid deposition and major US sources of acidic materials. Granitic is a very poor neutralizer of acid precipitation. The acid dissolves the rock, which in turn increases the pH of the runoff.