Multiple choice

The dispersion of pollutants in atmosphere is maximum when

  1. environmental lapse rate is greater than adiabatic lapse rate

  2. environmental lapse rate is less than adiabatic lapse rate

  3. environmental lapse rate is equal to adiabatic lapse rate

  4. maximum mixing depth is equal to zero
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A Correct answer
Explanation

 Unstable environment means ELR > ALR.

(ELR = Environment Lapse rate, ALR = Adiabatic Lapse Rate)

A rising air parcel will continue to go up and dispersion of pollutant will be rapid due to vertical mixing of air with pollutants.

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