Ammonia pollution is mainly from agricultural sources (especially animal manure, forestry and fertilizers) and it causes damage to sensitive habitats, affecting plants and biodiversity including soils and water, and upon accumulation in the atmosphere leads to long-range acidification. Pollution by ammonia is also a recognized problem in mines and in the marine environment. The emissions of ammonia are somewhat more uncertain than those of SO2 and NOx. However, ammonia synergistically interacts with the two gases in the atmosphere leading to little overall impact of their legislative control of the SO2 and NO_x in several countries. To date, little action has been taken by environmentalists to control the emission of ammonia, despite the fact that, ironically, upon decomposition in the environment, it has a similar fate to that of NO2.
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