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The Impact of the Pollution Control Measures for the 2008 Beijing Olympic Games on the Chemical Composition of Aerosols

机译：2008年北京奥运会对气溶胶化学成分的影响

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We investigated the difference in the concentrations of air pollutants between the period of the Beijing 2008 Olympic Games and the same periods in the prior three years (2005-2007, the reference period), in particular, the chemical composition of the particulate matter. PM10, Black carbon (BC), SO2 and NO2 were reduced by 33%, 31%, 32% and 51%, respectively, whereas PM2.5 was not reduced during the Olympic period when compared to the reference period. Many pollution control measures that had been applied to prevent air pollution from contaminating the air quality in Beijing during the Olympic Games significantly reduced the larger particles (PM10), SO2 and NO2 but it did not as effectively reduce the much smaller particles (PM2.5). The sum of the measured water-soluble ions in total suspended particles (TSP) during the Olympic period was reduced by 35% when compared to the reference period. We found a trend in the concentration of high-molecular weight polycyclic aromatic hydrocarbons (HMW-PAHs), which had 5-7 rings decreased during the Olympic period. We considered that the reduction of HMWPAHs that could be associated with the reduction of BC was due to the reduction of traffic flow resulting from traffic control measures implemented during that time period.
机译：我们调查了北京2008年奥运会期间浓度的空气污染物浓度和前三年（2005-2007，参考期），特别是颗粒物质的化学成分。 PM10，黑碳（BC），SO2和NO2分别减少了33％，31％，32％和51％，而与参考期相比，奥林匹克期间不会降低PM2.5。应用了许多污染控制措施，以防止奥运会期间北京中的空气质量污染空气质量显着降低了较大的粒子（PM10），SO2和NO2，但它没有那么有效地减少更小的颗粒（PM2.5 ）。与参考期相比，奥林匹克期间总悬浮颗粒（TSP）中的测量水溶性离子的总和减少了35％。我们发现在奥林匹克期间有5-7环的高分子量多环芳烃（HMW-PAH）浓度的趋势。我们认为，可能与BC减少有关的HMWPAH的减少是由于该时间段实施的交通管制措施产生的交通流量。

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