The acid rains are caused by the following pollutants:

- 1
  
  $S O_{2} a n d O_{3}$
- 2
  
  $S O_{2} a n d N O_{X}$
- 3
  
  $N O_{X} a n d O_{3}$
- 4
  
  $C O a n d S O_{2}$

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