This document defines and discusses five main types of pollution: air, water, noise, land, and radioactive. It provides introductions, causes, effects and prevention methods for each type. For air pollution, the major causes are identified as industries, automobiles, and domestic fuels. Effects on human health, animals, plants and atmosphere are described. Prevention methods include using natural gases, reducing fuel usage, and avoiding open burning. Water pollution is caused by industrial and sewage waste, and affects diseases and aquatic life. Prevention involves proper waste disposal and water treatment. Noise pollution stems from traffic, construction, industries and other sources, and its effects include hearing loss, stress and sleep disturbances. Prevention focuses on limiting noise from machines, transportation