In urban areas, fine particles caused by dust or pollution often cloud the air close to the ground. Which of the following terms best defines this event?

a. ozone

b. smoke pollution

c. haze

d. acid rain

c. haze

Haze is a form of air pollution, where the cloud particles and the smoke gases that released by most factories are combined.

Upward urban growth will increase pollution as the number of people will increase. The increase in population and obstruction of free movement of air because of upward urban growth will result in a "heat island". Since the number of inhabitants is going to increase with upward urban growth, waste management will also become an issue.