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首页> 外文期刊>Atmospheric Pollution Research >Rapid improvement in air quality due to aerosol-pollution control during 2012–2018: An evidence observed in Kunshan in the Yangtze River Delta, China
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Rapid improvement in air quality due to aerosol-pollution control during 2012–2018: An evidence observed in Kunshan in the Yangtze River Delta, China

机译：2012 - 2018年期间气溶胶污染控制因气溶胶污染控制而快速提高：中国长江三角洲昆山观察到的证据

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China's severe air pollution was widely concerned in the past decade. A rigorous emission control has been implemented by the Chinese government since 2013. It is essential to evaluate changes of air pollutants to understand effectiveness of present air-pollution control on improving air quality. Here, we investigate temporal trends of air pollutants, including PM2.5, SO2, NO2 and O3, observed at 12 sites over the Kunshan area in the Yangtze River Delta region during 2012–2018 using Mann-Kendall statistical test. Overall, significant reduction trends of monthly PM2.5 (?7.4% yr?1) were observed, together with reduction in the PM2.5 to CO ratio (?5.8% yr?1), an indicator of secondary aerosol production. Secondary aerosol precursors, SO2 (?10.3% yr?1) and NO2 (?4.4% yr?1) also presented statistically significant reduction trends. These results reflect the consequence of emission control that leads to substantial reduction in the bulk PM2.5 concentration, as well as secondary aerosols likely formed from SO2 and NO2. However, O3 had statistically significant increase trend (+3.4% yr?1) during 2014–2018. Limited formation of O3 under high PM2.5 and NO2 concentrations condition was found at daytime in summer, which might reflect one of the reasons causing the increase trend of O3 under the current reduction scenario of PM2.5 and NO2. Potential source contribution function analysis demonstrated that the transport from the regions located to northwest of Kunshan could contribute to high concentrations of PM2.5 in all seasons, while the south and southeast could be the high potential as source areas for O3.
机译：中国严重的空气污染在过去十年中广泛关注。自2013年以来，中国政府实施了严格的排放控制。重要的是评估空气污染物的变化，了解目前空气污染控制提高空气质量的有效性。在这里，我们调查2012 - 2012年在2012 - 2018年在长江三角洲地区昆山地区的12个地点观察到的空气污染物的时间趋势，包括PM2.5，SO2，No2和O3，在2012 - 2018年使用Mann-Kendall统计测试。总体而言，观察到每月PM2.5（？7.4％的YRα1）的显着减少趋势，以及减少PM2.5至CO比（Δ5.8％YR？1），是二次气溶胶生产的指标。二次气溶胶前体，SO2（α1.1.3％YR？1）和NO2（？4.4％YR？1）也呈现了统计上显着的减少趋势。这些结果反映了导致散装PM2.5浓度大幅度降低的排放控制的结果，以及可能由SO2和NO2形成的二级气溶胶。然而，2014 - 2018年，O3在统计上显着增加趋势（+ 3.4％？1）。在夏季白天发现，在白天发现，在白天发现o3和No2浓度条件的有限形成，这可能反映了导致在PM2.5和No2的当前减少方案下提高O3趋势的原因之一。潜在的来源贡献函数分析表明，位于昆山西北地区的地区的运输可能导致所有季节的高浓度PM2.5，而南部和东南可能是O3的源区的高潜力。

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