Điền vào chỗ trống ----- Nội dung dịch tự động từ ảnh ----- Air (1) is caused of ill health in human beings. In a lot of countries, there are laws limiting the (2) of smoke factories can produce although there is not enough information on the effects of smoke on the atmosphere. Doctors have (3) that air pollution causes lung diseases. The gases from the (4) of cars have also increased air pollution in most cities. The lead of petrol produces a poisonous gas, which is often collected in busy streets (5)____ by high huildinar exhausts circled amount pollution put proved