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Explain how the use of CNG in automobiles has reduced pollution in our cities.

3. Explain how the use of CNG in automobiles has reduced pollution in our cities.

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Fuels like petroleum and coal release toxic gases like carbon monoxide, carbon dioxide, and sulphur dioxide during combustion. These harmful gases cause pollution and respiratory problems.

Whereas CNG (Compressed Natural gas) is a clean fuel and produces these harmful gases in very small quantity. 

(CNG is methane stored at high pressure!)

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