What is the main source of pollution

1. Waste water from industry plant.
2. exhaust gas from vehicle & electric plant
3. occasional oil leakage from the oil tanker
4. occasional chemical pollution by traffic accident
5. sound pollution from public traffic & construction site
6. light pollution by neon light of those sign board
7. regular pollution by abuse of pesticide usage

1.air pollution , the factories smoke and cars smoke make the air been puluted
2.water pollution, factories waste and other waste just fill in the ocean ,so the water is polluted
3.nois pollution , cars , planes ,alot of machine and street makes alot of noise.
4.light pollution , in hong kong we can't see stars , because the light in hong kong is too much ,so that make us cant see the stars at night

2006-10-25 14:46:54 補充：
4.light pollution , in hong kong we can't see stars , because the light in hong kong is too much ,so that make us cant see the stars at night