The ecological environment in Haikou is perfect. The air pollution index is only 28, and it is superior to the first grade of the country's standard. It is the No.1 of all the large and medium sized cities in the country in terms of air quality. The quality of the groundwater in Haikou is fine, and it is basically mineral water. It is of the first class in the world, and the drinking water in city is up to the standard. Nowadays, 36.7% of the city area are covered with green. The a forestation rate is 40%, and the average public green belt is 8.5sq km. When you are walking in Haikou, you will find lines of green trees and beautiful flowers, and people can feel that there is life everywhere.