Coal based thermal power stations pollute the atmosphere by adding

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

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