Environmental pollution refers to the presence of physical, chemical, or biological agents in the environment at concentrations that can harm human health, safety, or welfare. It can affect humans, animals, and plants. Pollution arises from both natural sources as well as human activities like industry, transportation, agriculture, and waste disposal. The major types of pollution are air pollution, water pollution, and soil pollution. Common causes include domestic and industrial waste, excess fertilizers and chemicals, burning fuels and garbage, contaminated drainage, and vehicle emissions.