The Causing Factors of the Smog Phenomenon in Lampang Basin
Abstract
The objectives in this research about ‘the causing factors of the smog phenomenon in Lampang basin’ consist of: (1) to study and analyse the smoggy condition in Lampang Basin (2) To study the concerning factors including the amount of rainfalls, relative humidity, wind speed and exposed combustions that relate and affect the smoggy condition.The data that have been used in the analysis including the statistical data of the amount of rainfalls, relative humidity, and wind speed were acquired between 1st November 2014 to30th April 2015 from Lampang Meteorological Station. The statistical data of exposed combustions in the Lampang basin area are acquired from the Department of Natural Resources and Environment in Lampang. And the data of the amount of dust particles (PM10) in the atmosphere are acquired from the Pollution Control Department under the supervision of the Ministry of Natural Resources and environment. The statistics being used in the analysis are mean, standard deviation, Pearson’s correlation coefficient and stepwise multiple regression analysis.It has been found from the analysis of this study that: (1) The mean per 24 hour of the amount of PM10 in the atmosphere is 77.3326 micrograms per cubic meter (µg/m3) which is below the standard safety level of 120 µg/m3. The mean rose to its maximum level in March (x̄= 115.5161 µg/m3) followed by February (x̄= 107.8143 µg/m3), January (x̄= 69.5161µg/m3), April (x̄= 69.4367µg/m3) and November (x̄= 37.1600 µg/m3). (2) The analysis of pearson’s correlation coefficient results that every factor are significantly related to the smog phenomenon in Lampang basin (Y) at the level of .01. The positive affecting factors are: exposed combustions (X5) and wind speed (X4). And the negative affecting factors are: relative humidity (X2), air pressure (X3), and the amount of rainfalls (X1) (3) The stepwise multiple regression analysis results that the factor affecting the existence of smog phenomenon in Lampang basin is the relative humidity according to the following regression equation with standard score (Z) Y/ = -0.611X2which can predict the effect for 37.0% with the statistical significance at the level of .01.
Keyword : smog phenomenon, Lampang basin
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