The GATE Grind

GATE 2026 ES – Question 46

Air and Noise Pollution · Air Quality Management · 2 marks · Multiple select

Which are assumptions of the Gaussian plume dispersion model? Select all that apply.

  1. The concentration of pollutants emitting from the stack is continuous.
  2. The process is in steady state.
  3. The emitted pollutants are non-conservative.
  4. Diffusion dominates advection in the wind direction.

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Show answer and explanation

Correct answer: (A) The concentration of pollutants emitting from the stack is continuous.; (B) The process is in steady state.

Explanation

The classical plume model assumes a continuous source and steady meteorology/emission conditions, so the intended A and B apply. It treats the modeled pollutant as conservative over the travel time. Along-wind transport is dominated by advection; transverse and vertical turbulent spreading are modeled by Gaussian distributions. Hence C and D are false. Select **A, B**. A’s printed wording is interpreted as a continuous emission source.

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