The specified standard under US Ambient Air Quality standards for $s o_{2}$ , $N O_{2}$ and CO respectively are

- 1
  
  $100 μ g / m^{3}, 10 m g / m^{3}, 80 μ g / m^{3}$
- 2
  
  $80 μ g / m^{3}, 100 μ g / m^{3}, 500 μ g / m^{3}$
- 3
  
  $100 μ g / m^{3}, 80 μ g / m^{3}, 10 m g / m^{3}$
- 4
  
  $80 μ g / m^{3}, 100 μ g / m^{3}, 10 m g / m^{3}$

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