During February to April of every year, with the period of high air pressure have spread covered area north on inverse temperature layer, usually based on phase one of the height. Caused by the sinking air of the upper level (Subsidence Inversion), while sinking air compressor for the air to cause heat. It is a layer of air with temperature rises and air in the floor are well poised (Stable Air) caused a block or entrapped particles, which scatter to spread from the surface of the Earth. As a result, the quantity dust can't fly higher into the atmosphere, and cannot be spread out. Thus was born the accumulation of dust layer thickness up to gradually cause haze conditions. There is smog blanketed the firm and less than 1 km, and for monitoring the situation of heat spots (Hotspot) in Thai crisis causes of smog problems. During the next dry season of each year between the months of January through April. The northern areas are often faced with the problem, which is the main cause of smog caused by the burning of agricultural area. Burning of weeds along on wildfire and burning in the Community cause smog. Carbon ash dust Extractor Released into the atmosphere with the appearance is wok basin. The climate is dry and still make dust suspension in the atmosphere. Affecting environmental quality. Public health vision obscured, and affect tourism. In addition, during such times. Also found an increase in heat of the Mekong region, the Commander of one of the main reasons for the cross-border smog pollution. The Department of National Park, wildlife and plant conservation and pollution control Department of the Ministry of natural resources and the environment have been carried out to prevent and correct problems, and always. Therefore, in order to solve the problem of pollution from smog is going in the same direction, and more efficient. It is a policy to prevent and resolve the northern province 9-year smog 2557 (2014) so that relevant agencies implemented to manage the smog problem can occur in the year of the 2557 (2014) to be seen that the Wildfire situation. The climate during the January-April and the Thai nation area 2555 (2012) northeast is hot air, hot air is generally organized in several areas.
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