【正确答案】It is shown in the drawing that a young man wearing a white mask is staring at the polluted sky. There is a caption which reads "Air Quality" in the lower left comer of the portrayal, and huge characters "PM 2.5" in the lower fight.
Motor vehicle exhaust is the primary factor of the notoriously poor air quality for cities like Beijing, Jakarta and Delhi. The roads of the world's most populous urban areas are more flooded with motor vehicles than at any other time in history. Specifically, there are now more than five million cars on the road in Beijing, with over 1,000 new cars being registered every day. Shanghai, Guangzhou and other big cities have also witnessed strong growth in vehicle sales. Due to the lower quality of air, the occurrence of asthma and other lung-related ailments are considerably higher in large cities than in rural areas.
In my view, imposing driving restrictions in major cities can help to curb the problem of air pollution and thus promote a cleaner and greener environment. What is more, improved weather conditions and a greater number of blue-sky days can also help to boost the local population's general health.