Abstract: In order to focus on pollutant emission mitigation during the Nanjing Youth Olympic Games in August of 2014, the fine wind field data were obtained by the WRF model using the 6 hours interval NCEP/NCAR reanalysis data in August during 2010 to 2012 as driving field. Combing the observational particles and air pollutants concentration data, the surrounding source regions of main pollutants and its transport pathway that influences the air quality in August in Nanjing area were diagnosed by methods of a correlation analysis and a composite analysis. The results show that the dominant wind in August is southeast from sea to inland during Nanjing Youth Olympic Games, while the source area and transport pathway influencing the concentrations of main pollutants (SO₂, NO₂, PM₁₀) differ. The southwestern air flow with high SO₂ concentration from Hu’nan, Jiangxi and other regions has a great influence on the concentration of SO₂ in Nanjing; the southern air flow transport from Anhui and Zhejiang largely contributes the high NO₂ concentration in the ambient air in Nanjing; the southwestern pathway connecting the emission sources over Hubei is a key route in the PM₁₀ transport to Nanjing urban area.

Key words: font-family: "Times New Roman", mso-font-kerning: 1.0pt, mso-ansi-language: EN-US, mso-fareast-language: ZH-CN, mso-bidi-language: AR-SA, Foreign emission source')">mso-fareast-font-family: 宋体">Foreign emission source, color: windowtext, mso-bidi-font-size: 12.0pt, mso-bidi-font-weight: bold, Meteorological condition')">mso-ansi-font-size: 12.0pt">Meteorological condition, Transport pathway