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Emission controls and changes in air quality in Guangzhou during the Asian Games

机译：亚运会期间广州的排放控制和空气质量变化

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With the new air quality standards forthcoming in China, the Pearl River Delta region is facing new challenges to achieve its air quality goal. The success of the emission reduction measures introduced by local authorities in the run-up to the Guangzhou Asian Games demonstrated that the Pearl River Delta air quality can be improved by introducing integrated emission reduction measures. This paper combines observation data, emission reduction measures, and air quality simulations that were applied during the Asian Games (12-27 November 2010) to analyze the relationship between emissions and concentrations of pollutants in Guangzhou. The Asian Games abatement strategy totally reduced emissions of 41.1% SO_2, 41.9% NO_x, 26.5% PM_(10), 25.8% PM_(2.5)5 and 39.7% VOC. The concentrations of SO_2, NO_2, PM10 and PM_(2.5) were reduced by 66.8%, 51.3%, 21.5% and 17.1%, respectively. In Guangzhou, the main challenge to be overcome with the new air quality daily requirements is mostly for NO_2, PM_(2.5), and hourly ozone maxima. If pollutants maintain the same concentrations before and after the Asian Games, there will be 47.4% and 31.6% non-attainment days for NO_2 and PM2.5 respectively as a period average. Although PM_(10) concentration can meet the daily limits (150 μg m~(-3)), it is quite difficult to meet the annual limit value (70 μg m ~(-3)). One important implication is that the long-term, step-by-step integrated measures of the past six years work better than the strict, intensive, short-term measures on SO_2, NO_2 and VOC control. Dust control by limiting construction sites and watering the roads can further reduce 12.8% of the PM_(10) concentration. However, to reduce ambient PM_(2.5), the abatement strategy should be more complex and extensive. On the contrary, ozone pollution was not improved during the Asian Games, indicating that alleviation strategies should be improved by scientific studies to determine the appropriate control ratio of NO_2 and VOC in the Pearl River Delta region.
机译：随着中国新的空气质量标准的出台，珠三角地区在实现其空气质量目标方面面临着新的挑战。在广州亚运会前夕，地方当局采取的减排措施取得了成功，这表明珠江三角洲的空气质量可以通过采用综合减排措施来改善。本文结合了在亚运会（2010年11月12日至27日）期间应用的观测数据，减排措施和空气质量模拟，以分析广州的排放与污染物浓度之间的关系。亚运会的减排策略共减少了41.1％SO_2、41.9％NO_x，26.5％PM_（10），25.8％PM_（2.5）5和39.7％VOC的排放。 SO_2，NO_2，PM10和PM_（2.5）的浓度分别降低了66.8％，51.3％，21.5％和17.1％。在广州，每日新空气质量要求要克服的主要挑战主要是NO_2，PM_（2.5）和每小时臭氧最大值。如果污染物在亚运会之前和之后保持相同的浓度，则平均时期内NO_2和PM2.5的不达标天数将分别为47.4％和31.6％。尽管PM_（10）的浓度可以满足每日限值（150μgm〜（-3）），但要达到年度限值（70μgm〜（-3））却非常困难。一个重要的含义是，过去六年中采取的长期，逐步的综合措施要比对SO_2，NO_2和VOC控制的严格，密集的短期措施效果更好。通过限制建筑工地和给道路浇水来控制灰尘，可以进一步降低PM_（10）浓度的12.8％。但是，为降低环境PM_（2.5），减排策略应更加复杂和广泛。相反，亚运会期间的臭氧污染并未得到改善，这表明应通过科学研究来确定缓解策略，以确定珠江三角洲地区合适的NO_2和VOC控制比例。

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