Question

suggest four preventive measures for air pollution

Answer 1

stopping the burning of fossil fuel.
stoppage of using materials which emit chlorofluorocarbons.
Shutting down of industries
Limiting the usage of vehicles.

Answer 2

Here is your answer
WE can prevent by the following method
..the factories should be constructed away from the cities
..grow more trees to prevent pollution
.make the chimney of the factory very high so that the pollutants do not spread in the biosphere
.. burning of polythene should be strictly prohibited
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