Based on the observational wind profile data

temperature sounding data and the hourly PM

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 concentration data from the boundary layer observation experiment in Dongguan region during December 2013

the influence of atmospheric boundary layer structure on PM

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 concentration in Dongguan region has been discussed. It was found that the PM

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 air pollution weather occurred in winter of Dongguan region was mostly influenced by the weather system of weak southward moving cold air. Under the control of continental cold high

the evolution of atmospheric boundary layer structure was very typical. During the PM

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 air pollution situation

the daily mean height of mixing layer in daytime was lower than 600 m sometimes

the pollutants accumulated persistently and its concentration increased gradually with the low atmospheric boundary layer height. The height of stable boundary layer in nighttime was about 100 m. By reason of the law height of stable boundary layer in nighttime

the peak PM

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 concentration occurred in nighttime. The vertical wind field of Dongguan region had obvious three layer construction. The lower layer with slow wind speed made the pollutants accumulate inside atmospheric boundary layer and hard to diffuse. The middle layer which appeared in a very low height with slow wind speed gave rise to the pollutants be compression inside lower layer further. Under the control of continental cold high in winter

the inversion layer appeared frequently in Dongguan region during PM

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 air pollution situation. The height of low altitude inversion base was about 700 m with a large thickness and intensity; the surface inversion occurred in nighttime frequently with a thickness of about 100 m.