Acid rain is caused by or recent reports of acid rain in some industrial cities are due to the effect of atmospheric pollution by [MP PMT 1987, 90; BHU 1989; CPMT 1989; CBSE PMT 1988, 89; KCET 1994; EAMCET 1995; Pb. PMT 2004]

• A. Excessive release of\[C{{O}_{2}}\]by burning of fuels like wood and charcoal, cutting of forests and increased animal population
• B. Excessive release of \[N{{O}_{2}}\]and \[S{{O}_{2}}\] in atmosphere by burning of fossil fuel
• C. Excessive release of \[N{{H}_{3}}\] by industrial plants and coal gas
• D. Excessive release of \[CO\] in atmosphere by incomplete combustion of coke, charcoal and other carbonaceous fuel in paucity of oxygen