San Francisco is one of the many cities in the world that has problems with ______________, a type of pollution that can affect the health of its residents.
  1. Mist
  2. Smog
  3. Fog
  4. Noise pollution
Explanation
Answer: B -San Francisco is one of the many cities in the world that has problems with smog, a type of pollution that can affect the health of its residents. Smog is a combination of smoke and fog caused by pollutants such as vehicle emissions. Asthma is one of the health conditions that can be affected by smog.
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