Some of the ways to control pollution caused by Automobiles are-

1. Vehicles should be properly tuned so that hydrocarbons are completely burnt. This would reduce the pollution due to hydrocarbons.

2. Air filters should be regularly cleaned and air-fuel ratio should be properly adjusted so that sufficient oxygen is available for combustion of hydrocarbons (gasoline or diesel). This would reduce CO and hydrocarbons in the exhaust gases.

3. Vehicle may be fitted with suitable catalyst converter, which converts poisonous CO, NO, and hydrocarbons to less harmful products such as CO2 and N2.

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4. Vehicles should be properly maintained so that these are minimum emissions from fuel tank or from carburetor.

5. Preferably, fuel-efficient vehicles should be used.