answer: #Person2# explains to #Person1# that the ozone is an air pollutant and ozone causes smog, which affects people's health.
documents: #Person1#: I've heard of ground-level ozone but can you explain what it is exactly?
  #Person2#: Yes, it's one of the main air pollutants. Factories don't emit it directly into the air. It's actually formed when nitrogen oxides and VOC emissions come into contact with heat and sunlight.
  #Person1#: Sorry? What does VOC stand for?
  #Person2#: Oh, Vous are'volatile organic compounds'. That's a technical term for solvents or other chemicals found in things like paint.
  #Person1#: So, what damage does ozone do to the environment?
  #Person2#: Well, it can cause smog, which can affect people's health - especially people with breathing difficulties.