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Cities and other urban agglomerations generate such a large quantity of wastes that, their safe disposal is a great challenge. Although many technologies have been developed to ensure their safe disposal, in capital deficit countries like India adopting such technologies is either partial or negligible. This has caused number of problems including air pollution.
City wastes, especially sewage, can generate large quantity of methane, nitrate and carbon di sulphide gases - if not decomposed properly. They add fowl smell in addition to causing serious air pollution.
