pH of 1 to 6, the lower the pH number, the stronger, or more corrosive. Stern, Arthur C., Boubel, Richard W., Turner, Bruce D., Fox, Donald L. Fundamentals of Air Pollution (2nd Ed.) Academic Press, Inc: (1984), 153 reported Rain, snow, or fog with a pH below 5.6 is considered acid rain due to the presence of H2SO4 and HNO3 dissolved or formed in the droplets. These strong acids dissociate and release hydrogen ions, resulting in more acidic droplets. The overall pH of any given droplet is a combination of the effects of carbonic acid, sulfuric and nitric acids, and any neutralizers such as ammonia.
             Dry deposition refers to acidic gases and particles. Stern, Arthur C., Boubel, Richard W., Turner, Bruce D., Fox, Donald L. Fundamentals of Air Pollution (2nd Ed.) Academic Press, Inc: (1984), 154 said that gaseous SO2, NO2, and HNO3, and acid aerosols are deposited when they contact and stick the surface of mater bodies, vegetations, soil, and other materials. If the surfaces are moist or liquid, the gases go into a solution. The acids forms are the same as of that falling in the form of acid rain. SO2 and NO2 can undergo oxidation, forming acids in the liquid surfaces if oxidizers are not present. Combination of wet and dry depositions makes the rain more acidic than the falling rain alone.
             Bodies of water, Land, and vegetation, are the surfaces on whi
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