The air quality index used in Thai Calculated by comparing air quality standard in the general atmosphere of air pollutants such as ozone, category 5 (O3) on average 1 hour nitrogen dioxide (NO2) on average 1 hour. (CO) 8-hour average sulphur dioxide (SO2) 24 hour average and dust smaller than 10 micron (PM10) 24-hour average. Air quality index, calculated what kind of air pollutants with maximum value.
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