text: Finally, We should limit the usage of cars because if we do we can stop smog. Smog is pollution that creates clouds all around and it is discusting and horrible for the earth. 'Bejing, China is known as one of the most polluted cities in the world."(Paris bans driving due to smog, Paragraph 14) After intensifying smog, congestion was down 60 percent and thats only after 5 days thats incredible!