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pollution The act of making something as dirty, smelly, or unpleasant as possible by introducing harmful substances into the environment. ■ "I accidentally polluted my neighbor's yard with dog poop. I guess you could say I have a 'poopy' track record."
City A large town with a lot of buildings, roads, and people. Often full of noise, pollution, and crime. ■ "I moved to the city from the countryside. Now I'm constantly surrounded by honking horns and smog."
mask A garment worn over the face to conceal one's identity or to protect against environmental hazards such as air pollution or UV radiation. ■ "I wore a mask at the party because I didn't want people to recognize me."
Soot A thick, black, sticky substance that is produced by the burning of coal or other fuels. It is often associated with pollution and health problems. ■ "The air was sooty and smelled like burnt rubber. I guess it's just the price we pay for having a warm house in the winter."