In order to analyze the characteristic of PM2.5 concentrations and assess the effect of the temporary control measures during the APEC meeting, the variation of PM2.5 concentration and its components before-, during- and after-APEC were analyzed and the role of meteorological conditions and pollution control measures to the improvement of air quality were explored. Then CAMx-PSAT model was used to quantitatively analyze the effect of improving the air quality of the pollution control measures for different sources in different regions. Different scenarios were defined to compare the situations between the control measures implemented or not during the APEC meeting. The results showed that the average daily PM2.5 concentration in Beijing during the APEC was lower than the National Environmental Standard Ⅱ (75μg/m3), PM2.5 pollutants were mainly emitted from the local emission sources, of which vehicle exhaust was the main pollution source, accounting for 36.1%. PM2.5 concentrations in Beijing decreased by 43.0% because of the implementation of the temporary control measures during the APEC meeting. The stringent control measures implemented in Beijing and its surrounding areas dominantly contributed for "APEC blue".
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