Pollution is the contamination of natural substances like land, air, water and noise. The document outlines the causes and effects of four types of pollution: air pollution caused by smoking, industries and spitting with effects like asthma and increased carbon dioxide; water pollution from deforestation, soil erosion and acid rain which kills sea life and spreads disease; noise pollution from loud noises, traffic, and construction disturbing birds, plants and causing deafness; and land pollution from chemical waste, excretion, and lack of dust bins making the land infertile and spreading nervous system diseases.