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1)industries make a lot of air pollution by leaving out harmful gases
2)vehicles make a lot of pollution by giving out carbon monoxide etc
2 5 2
1.increasing no. of vehicles on road giving out harmful gases into air.
2.burning of fossil fuels.
3.industries emitting harmful toxic gases into air.
 4.burning of crackers. 
2 5 2
plzz mark it as brainiest
burning of fossil fuels
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