1. What can make people sick?
Air pollution can make people sick.
2. Where does smoke come from?
Smoke comes from factories.
3. Can air pollution cause lung diseases?
Yes,it can.
4. What else can cause air pollution in cities?
The gases from the exhausts of cars, lead in petrol can cause air pollution in cities.
5. Why does the earth’s climate become warmer?
Because the gases in the atmosphere continue to increase.