CONCLUSION

  There is a lot of people in Hong Kong. The street are very busy every day. The population is high. I think the government should aware of the air pollution in Hong Kong and carries policy to solve it.  People should use public transport instead of private cars. These may reduce the amount of dust in open areas.

  However, the policy in other countries are good to solve these problems. There is no dust in cars. They use electricity to work their cars or fuel without harmful effects.

  The transport are improved around this few years. We can travel by trams to release our stress. Although trams are the slowest public transport in Hong Kong, we may find something interest in trams.