Principles spread of pollutants in the air using 3 main reasons: 1) the exhaust area. (Source control), 2), ventilation, and 3) to make the air cleaner.
The main spread of สารมลพิษ in the air by using 3 main reasons. 1) The ventilation area only (source control), 2) the general ventilation and 3) to make the air cleaner