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Size-segregated aerosols were collected in Urumqi,a megacity in northwest China,during two heating seasons before(heating season Ⅰ: 2012.1-2012.3)and after the project "shifting coal to natural gas"(heating season Ⅱ: 2014.1-2014.3),and determined for n-alkanes,PAHs and oxygenated PAHs to investigate the impact of the replacement by natural gas on organic aerosols in the urban atmosphere.