The correct answer is A. True
Step-by-step explanation:
One main cause of air pollution is car's emissions because these contain nocive substances such as nitrogen oxides or carbon monoxide that rise to the atmosphere and pollute the air. This type of pollution varies depending on the model of the car because nowadays modern cars are designed to be more environmentally friendly.
In the case of Africa, air pollution has become a major environmental problem in the last years, and this is related to the fact most vehicles in the region are old and due to this, emit more nocive substances than modern vehicles found in industrialized regions. Thus, it is true Africa has a high level of air pollution as a result of more old vehicles.