Because it is a city where the majority of the farming area in the Highlands and lowlands, which is due in early January to the middle of April there will be a harvest, and there will be a burning agricultural waste. To adjust the burning soil again, both Chiang Rai is also a tourist attraction, there may be fumes caused by vehicle travel during the month of December. From the above, it is anticipated that there may be cause for the disease, which is caused by the air pollution and the current RAI found many environmental problems from different factors, which environmental problems found in Chiang Rai province is. Problems of water, waste, contamination of the air, disaster, etc.
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