A major source of air pollution are 3 sources of exhaust emissions from vehicles in urban areas. The burning of biomass such as rice straw, waste, or in rural areas. And discharges from industrial facilities. During February through April of each year. Many farmers began burning forests for shifting cultivation surface preparation resulted in a lot of smoke covering the area. March past Forest fires in the northern area, which caused the fire to the forests of Thailand and Burmese farmers. Make many areas in the north are covered with haze. Although the tribes were illegally forbidden to practice, but the burning continues because most farmers how to grow accustomed to this.
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