Objective   To explore the concentrations, distributions and variations of paticles and PAHs and NPAHs in ShenYang and to analyze their effects on humans health.

  Methods   Three primary schools in different areas of Shenyang are selected by the traf2 fic situation in their vicinity and the monitoring instruments are installed.The involved schools are Heping second school, Wenyi second school and Taishan school.The around-the-clock samplings were carried out during the non-heating period, the heating period for a week in 2001 and 2002.Samples of particles were detected by HPLC/FLD(for 10 kinds of PAHs)and HPLC/CLP(for 11 kinds of NPAHs).

  Results   The 10 kinds of PAHs in the particles are Fluoranthene(Flu)、Pyrene(Pyr)、Benzaanthracene(BaA), Chrysene (Chr), Benzobfluoranthene(BbF), Benzokfluoranthene(BKF), Benzoapyrene(BaP), Dibenzoa, harthracene(DBA), Benzo ghiperylene(BgPe), Indeno1, 2, 3-cdpyrene(IDP), while those with 4 phenyl groups were primary.The 11 kinds of NPAHs are 1, 3-dinitropyrene(1.3-DNP), 1, 6-dinitropyrene(1.6-DNP), 1, 8-initropyrene(1.8-DNP), 2-nitrofluorene(2-nF), 2nitropyrene(2-NP), 4-nitropyrene(4-NP), 1-nitropyrene(1-NP), 6-nitrochrysene(6-NC), 7-Nitrobenzoaanthracene(7 -NBaA), 3-nitroperylene(3-NPer), 6-nitrobenzoapyrene(6-NBaP).The rank of the concentration of PAHs and NPAHs from high to low is Heping district, Shenhe district and Huanggu district.The particles whose diameter are less than 2.1μm account for 71%, 67% of the PAHs and NPAHs in Shenyang.

  Conclusion   The pollution of combustion of coal is the major source of particles and PAHs and NPAHs.More attention should be paid to the prevention.