Question

9.
when air pollution hangs over urban areas and reduces visibility, it is called ______.

10.
a type of air pollution that comes from construction, agriculture, forestry, and fires. it consists of tiny pieces of liquid or solid matter like soot from a fire and is called ______.

Explanation:

1. For question 9: This is a specific urban air pollution phenomenon that traps pollutants near the ground, lowering visibility.
2. For question 10: This refers to particulate matter, which are small solid/liquid particles from the listed sources.

Answer:

1. smog
2. particulate matter (or particulate pollution)