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Ammonia, a gas containing nitrogen molecules, is usually found in trace quantities in the atmosphere and plays a vital role in biochemical processes. When plants die, or animals excrete, the nitrogenous compounds in these residues get converted into ammonia. In the presence of specific soil bacteria, some ammonia gets converted into atmospheric nitrogen. However, large amounts of ammonia in the atmosphere is dangerous to plants. It damages the leaves, reduces essential nutrients, increases toxic substances in the plants, decreases their tolerance to drought and frost, and makes them more vulnerable to pests and disease-causing microorganisms. In the presence of moisture, ammonia can settle on our skin, killing the cells.