Factories are the most air pollution around the city 2. “ Air pollution 3. “ Multiple causes} one effect 4. “ Factories, cars and smoking are affecting the air pollution 5. “ The reasons of the air pollution are companies, cars and smoking 6. “ Smoking, factories and cars are affecting the air pollution Factories are the most air pollution around the city Cars are killing the air pollution inside the city where the people live Smoking smothers people in the street while they are walking or inside buildings -Government most make rules for people who is smoking and cars.