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Text File  |  1992-09-02  |  259b  |  9 lines

  1. Smog is a natural FOG containing impurities,
  2. mainly nitrogen oxides (NOx) and volatile
  3. organic compounds (VOCs) from domestic fires,
  4. industrial furnaces, certain power stations,
  5. and internal-combustion engines (petrol or
  6. diesel).  
  7.  
  8. Subject by: Amanda Gibbon
  9.