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Local air pollution is usually caused by local factories, coal-burning power plants and traffic. It can also be caused by people burning wood for cooking.

Coal-burning power plants can be replaced with renewable energy. Solar panels are now as cheap as coal, are cleaner, emit no polluting carbon dioxide and other gases, and last for 25 years. Coal lasts for 5 minutes, then more has to be bought.

Factories and transport can run on electricity that is from renewable sources.

In China, Beijing has now closed all the coal power plants in the city, because of the air pollution. It still has to import electricity from outside, but it is installing huge amounts of renewable energy power plants every year.

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Q: How the air pollution of mega-cities of Bangladesh can be reduced substantially?
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