The Box Model in air pollution dispersion is used to estimate pollutant concentrations in a city. This model assumes that:
- A Pollutants are uniformly mixed in a defined volume of air ✓
- B Wind speed is zero
- C Pollutants undergo chemical transformation
- D The source is a single point
Correct answer: A. Pollutants are uniformly mixed in a defined volume of air
Explanation
The Box Model assumes that pollutants are uniformly mixed within a defined box (volume) of air over a city, with steady-state conditions and constant emission rates. It does not assume zero wind speed (it includes ventilation). Chemical transformation is not a core assumption. The model is for area sources, not a single point source. The key assumption is uniform mixing within the defined volume.
Reference: Park's Textbook of Preventive and Social Medicine, 26th ed.
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