Prediction of small dust in the country's North on Thai with grey system theory GM (1, 1) was found to have a very high trend values into two ranges: 1. During the months of January through April. Trend micro dust is in Mae Hong Son province. Lampang, Chiang Rai and Chiang Mai, respectively, and 2. During the month of October until December. Trend micro dust is in Lampang, Chiang Rai and Chiang Mai, respectively, with the exception of Mae Hong Son province.
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