Pollutants come from various sources and entered the air, water and soil in various ways. Air pollutants mainly come from motor vehicles, industrial, and waste incineration. Air pollutants can also come from volcanic activity.
Pollution of rivers and ground water mainly from domestic, industrial, and agriculture. Mainly domestic waste water BOD, COD, and organic substances. Generate industrial waste water BOD, COD, organic substances, and various toxic pollutants. Liquid waste from agricultural activities, especially in the form of nitrate and phosphate.
