pollution

1. what are the types of pollution

1.1. sound pollution

1.2. land pollution

1.3. air pollution

1.4. water pollution

2. how to reduce pollution?

2.1. regulate the factories

2.2. set up special laws for cars

2.3. makes large trucks go thorugh special roads to not disturb the residents

3. what are the causes of pollution?

3.1. trucks making noise

3.2. factories making smoke

3.3. excessive use of cars