1. Bicycles do not cause air or sound pollution.

2. Sound pollution even during the night time is a dominant problem for these colony dwellers.

3. Serious sound pollution bringing more attention on the conflict of power consuming and environment protection, then how to solve this difficulty becomes a focus in the world.

4. There are many kinds of pollution, like sound pollution, air pollution and water pollution.

5. KTV establishments to become a serious sound pollution, the noise originated.

6. It is an important way with the sound - absorbing materials to improve the sound pollution.

7. Planting more trees and grass , controling the air and sound pollution and every countrymen in China fight tooth and nail to make great contribution for the Green Olympic.