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CCPortal

DOI	10.5194/acp-21-4007-2021
	A comparison of long-term trends in observations and emission inventories of NOx
	MacDonald E.; Otero N.; Butler T.
发表日期	2021
ISSN	1680-7316
起始页码	4007
结束页码	4023
卷号	21 期号:5
英文摘要	Air pollution is a pressing issue that is associated with adverse effects on human health, ecosystems, and climate. Despite many years of effort to improve air quality, nitrogen dioxide (NO2) limit values are still regularly exceeded in Europe, particularly in cities and along streets. This study explores how concentrations of nitrogen oxides (NOi x NO+ NO2) in European urban areas have changed over the last decades and how this relates to changes in emissions. To do so, the incremental approach was used, comparing urban increments (i.e. urban background minus rural concentrations) to total emissions, and roadside increments (i.e. urban roadside concentrations minus urban background concentrations) to traffic emissions. In total, nine European cities were assessed. The study revealed that potentially confounding factors like the impact of urban pollution at rural monitoring sites through atmospheric transport are generally negligible for NOi x. The approach proves therefore particularly useful for this pollutant. The estimated urban increments all showed downward trends, and for the majority of the cities the trends aligned well with the total emissions. However, it was found that factors like a very densely populated surrounding or local emission sources in the rural area such as shipping traffic on inland waterways restrict the application of the approach for some cities. The roadside increments showed an overall very diverse picture in their absolute values and trends and also in their relation to traffic emissions. This variability and the discrepancies between roadside increments and emissions could be attributed to a combination of local influencing factors at the street level and different aspects introducing inaccuracies to the trends of the emission inventories used, including deficient emission factors. Applying the incremental approach was evaluated as useful for long-term pan-European studies, but at the same time it was found to be restricted to certain regions and cities due to data availability issues. The results also highlight that using emission inventories for the prediction of future health impacts and compliance with limit values needs to consider the distinct variability in the concentrations not only across but also within cities. © Author(s) 2021. This work is distributed under the Creative Commons Attribution 4.0 License.
语种	英语
scopus关键词	air quality; atmospheric pollution; comparative study; concentration (composition); emission inventory; nitrogen dioxide; trend analysis; urban pollution; Europe
来源期刊	ATMOSPHERIC CHEMISTRY AND PHYSICS
文献类型	期刊论文
条目标识符	http://gcip.llas.ac.cn/handle/2XKMVOVA/247057
作者单位	Institute for Advanced Sustainability Studies, Berliner Straße 130, Potsdam, 14467, Germany; Institute for Environmental Science and Geography, University of Potsdam, Karl-Liebknecht-Str. 24-25, Potsdam, 14476, Germany; Institute for Meteorology, Free University of Berlin, Carl-Heinrich-Becker-Weg 6-10, Berlin, 12165, Germany
推荐引用方式 GB/T 7714	MacDonald E.,Otero N.,Butler T.. A comparison of long-term trends in observations and emission inventories of NOx[J],2021,21(5).
APA	MacDonald E.,Otero N.,&Butler T..(2021).A comparison of long-term trends in observations and emission inventories of NOx.ATMOSPHERIC CHEMISTRY AND PHYSICS,21(5).
MLA	MacDonald E.,et al."A comparison of long-term trends in observations and emission inventories of NOx".ATMOSPHERIC CHEMISTRY AND PHYSICS 21.5(2021).