From the graph above, it can be seen clearly that the results of the first 30 seconds of measurement (11:57:34) can be effected by transportation noise. The pattern of sound pressure level are totally difference from the other. If the blue line is neglected, the rest of the results are shown the similar pattern. However the low frequencies shift (25-500Hz) can be observed. This may due to the wind impact the measuring microphone. Therefore the true sound pressure level at k.Thitirat’s house can be read at 11:58:34 (the lowest green line). Therefore the A-weight Equivalent continuous noise level, LAeq at K.Thitirat’s house is 55.3dBA when the block 1 and 2 are reserved.