Q. With reference to Urban Canyon Effect, consider the following statements:
1. It is caused when traffic-related air pollution gets substantially elevated along a road surrounded by tall buildings.
2. Concentration of pollutants in the ambient air gets increased due to this effect.
Which of the statements given above is/are correct?

[A] 1 only

[B] 2 only

[C] Both 1 and 2

[D] Neither 1 nor 2

Answer: C

Both statements are correct.  

Over the past three days, Colaba and Mazagaon in South Mumbai have emerged as the most polluted localities in the city. In Mumbai, from the Mumbai monsoon to the winter, the city gets slow or static wind speed. The build-up of pollutants in the locality (Colaba) could be because of the urban canyon effect. 

Source: Indian Express