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In this study,PM10 samples at four locations of Loudi,China were collected from January 2017 to March2017 and December 2017 to February 2018 at first.Then,a new analytical strategy of second-order calibration based on the alternating trilinear decomposition(ATLD)coupled with gas chromatography-mass spectrometry(GC-MS)was firstly developed for quantitative analysis of seven PAHs in these samples.