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- W2070336396 abstract "Air quality in cities has been extensively studied due to the high population density potentially exposed to high levels of pollutants. The main problems in urban areas have been related to particulate matter (PM) and NO 2 . Less attention has been directed towards O 3 because urban levels are generally lower than those recorded in rural areas. The implementation of air quality plans, together with technological improvements, have resulted in reductions of PM and NO 2 levels in many European cities. In contrast, urban O 3 levels have experimented increases which may respond to declining NO x emission trends. It is therefore necessary to intensify the study of urban O 3 and its potential relation with NO x variations. In the agglomeration of Zaragoza (NE Spain), traffic circulation through the centre has dropped by 28.3% since 2008 due to several factors such as the implementation of a mobility plan, the completion of major construction projects and the economic crisis in Spain. The study of this case offers a unique opportunity to evaluate the impact of reductions in NO x emissions on the levels of O 3 in a characteristic Mediterranean city. This work analyses the variability and trends of ambient air levels of O 3 and NO x in Zaragoza and the Ebro valley from 2007 to 2012. Results demonstrate that, although the main factor explaining O 3 variability is still linked to meteorology, changes in NO x emissions strongly influence O 3 variability and trends, mainly due to interaction with fresh NO. Specific analysis of the O 3 “weekend effect” show a significant correlation ( r 2 = 0.81) between the drop of NO concentrations (associated to emissions) and the increment of O 3 levels during weekends. Moreover, trend analyses reveal that the decline in NO x emissions in Zaragoza from 2007 to 2012 can be associated with significant increments in O 3 levels. • Evaluation of the impact of NO x reductions in urban O 3 levels in Spanish agglomeration (Zaragoza). • Variability of O 3 strongly influenced by NO x emission patterns (NO titration). • Increasing O 3 in Zaragoza in 2007–2012 associated with reduction in NO. • Correlation between NO drops and O 3 increases in weekends (low emissions periods)." @default.
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- W2070336396 date "2014-12-01" @default.
- W2070336396 modified "2023-10-18" @default.
- W2070336396 title "Urban influence on increasing ozone concentrations in a characteristic Mediterranean agglomeration" @default.
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- W2070336396 doi "https://doi.org/10.1016/j.atmosenv.2014.09.061" @default.
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