Q: Smog is one example of what type of pollution?


Read this paragraph and choose the correct option from the provided answers:

This picture shows a thick layer of smog and dust over a very polluted city (Singapore). Smog in the air is a serious health hazard for people living in many big cities around the globe. Smog is one example of air pollution.

 Choices:

- light

- energy

- sound

- air


A:
air