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smog A dense fog that blankets a city and makes it impossible to see anything, especially during rush hour. ■ "I accidentally drove into a smog while on my way to work this morning. It was so thick that I couldn't even tell if I was going the right way!
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."
emissions The act of letting out or expelling something, usually in the form of gas or vapor. ■ When the car's emissions were too high, it failed its smog test and had to be fixed.
Particles The smallest units of matter that make up everything in the universe. They are too small to be seen with the naked eye, but they can be detected by various scientific instruments. ■ Scientists have discovered a new type of particle called the "particulate matter" which is responsible for the smog that covers cities.