(b) Dry Deposition

♤ In areas where the weather is dry, the acid chemicals may become incorporated into dust or smoke and fall to the ground through dry deposition, sticking to the ground, buildings, vegetation, cars, etc.

♤ Dry deposited gases and particles can be washed from these surfaces by rainstorms, through runoff.

♤ This runoff water makes the resulting mixture more acidic.

♤ About half of the acidity in the atmosphere falls back to earth through dry deposition.