RESUMO
Research on PM10, and PM2.5, aerosols had been carried out with sampler of large flow capacity during the Spring Festival of 2007 in Beijing, and the concentration of polycyclic aromatic hydrocarbons (PAHs) in PM2.5, samples were determined via GC-MS. The average concentrations of aerosols are higher in the night (PM10: 232 microg x m(-3); PM2.5: 132 microg x m(-3)) than those in the day time (PM10: 194 microg x m(-3); PM2.5: 107 microg x m(-3)). The average concentrations are higher after the new year's eve (PM10: 252.3 microg x m(-3), PM2.5: 123.8 microg x m(-3)) compared with those before (PM10: 166.7 microg x m(-3), PM2.5: 106.8 microg x m(-3)). And we also find that the concentration of PAHs in PM2.5 aerosols is generally higher in the night (106.4 ng x m(-3)) than that in the day time (44.2 ng x m(-3)), and the total concentration of 17 PAHs before new year's eve (95.9 ng x m(-3)) is higher than that after (58.9 ng x m(-1)). Those results may mean that the aerosols are influenced by burning of fireworks in addition to be subjected to the meteorological condition. At the same time, there is little influence of playing fireworks on the PAHs concentration, and the changes of the concentration of PAHs can be explained by the decrease of industrial and vehicular transportation pollutant during the Festival period. It can be judged by the characteristic ratio such as Fuloranthene/pyrene that the primary resource of PAHs in particles is the combustion of coal, and the combustion of gasoline is in the next place.
