Modes of controlling pollution in large cities

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Shifting of factories out of the residential area

Less use of insecticides

All the above

Proper disposal of organic wastes, sewage, and industrial effluents

answer is D.

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Detailed Solution

Large cities feature dense populations as well as concentrated industrial and manufacturing areas. As a result, managing home sewage and industrial effluents is difficult since they significantly pollute the water. Additionally, the location of industries must be chosen such that the air pollutants they release do not immediately reach populated areas. Therefore, it is believed that maintaining cleanliness, using fewer pesticides, properly disposing of organic waste, sewage, and industrial effluents, building wider roadways, and moving factories away from residential areas are all necessary measures to reduce pollution in big cities.

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