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Air polluted when it contains harmful materials. There are two types of air pollution. Natural pollution and pollution caused by people. Natural pollution is caused by pollutants from nature, like dust in volcanic eruption, fog, etc.

Pollution caused by people is produced by industrial waste and fume from vehicles like cars, buses or trucks. It is more dangerous because they contain harmful material for people to breathe, for example Oxides and sulfur which can be found in burning fuels can damage people lungs. Carbon monoxide is poisonous gas from the incomplete burning of the carbon in fuel, gas, coal and oil. Most of the carbon monoxide in the air comes from the exhaust of the vehicle.

1.         How many kinds of air pollution mentioned in the text above?

1. Two
2. Three
3. Four
4. Five

2.         Why is pollution caused by people more dangerous?

1. Because it is produced by industrial waste and fume
2. Because it contains harmful material
3. Because it is from trucks and buses
4. Because people breathe it

3.         We can find oxides and sulfur in the …

A.    Burning fuels

B.     Vehicle

C.     Lungs

D.    Material

4.         “… They contain harmful material for people ….” The underlined word means……

A.    friendly

B.     dangerous

C.     simple

D.    useful