text: Next, limiting car usage will prevent your beautiful city from being covered in smog. Smog is nasty and makes your environment (home) look nasty as well. Smog is pollution that travels through the air and allows the sky/clouds to look grey and the air to be filled wih all types of horrible gasses. I'm sure you wouldn't like going out side and seeing your environment be all gloomy and disgusting because of your vehicals.