private car Today an increasing family own one or more cars in urban areas, both in developed countries and developing countries. Some people believe that the private car is more convenient than the public system, while others think a great number of private cars lead to traffic jam and air pollution. I agree with the latter view. On the one hand, it is very convenient to own a car, especially in the areas which public transport systems are not enough. Have a car means that people can go whenever and wherever they want. This is very useful in an emergency situation. For example, if one family member is ill at midnight when the bus and subway are both closed, and cannot book a taxi, use the private car to go to the hospital on time is essential. In other words, the private car is more flexibility. On the other hand, more and more cars on the roads mean that both the traffic and air is getting worse. Nowadays traffic jam is the norm in the big city all around the world. A survey revealed by the National Transportation Center in China found that more than 60% of the working people need more than 3 hours from home to work. In addition, a traffic jam caused serious air pollution. Heaps of studies have conducted research on the relationship between cars and air quality, and they all showed air quality is significantly affected by the number of cars. In conclusion, the adverse effects of private car outweigh their advantages. More private cars mean less convenient traffic and unhealthy air.