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. We analyzed 2005–2017 data sets on ozone ( O3 )concentrations in an area (the Vic Plain) frequently affected by theatmospheric plume northward transport of the Barcelona metropolitan area(BMA), the atmospheric basin of Spain recording the highest number ofexceedances of the hourly O3 information threshold(180  µ g m −3 ). We aimed at evaluating the potential benefitsof implementing local-BMA short-term measures to abate emissions ofprecursors. To this end, we analyzed in detail spatial and time variations ofconcentration of O3 and nitrogen oxides (NO and NO2 ,including OMI remote sensing data for the latter). Subsequently, asensitivity analysis is done with the air quality (AQ) data to evaluatepotential O3 reductions in the north of the BMA on Sundays comparedwith weekdays as a consequence of the reduction in regional emissions ofprecursors. The results showed a generalized decreasing trend for regional background O3 as well as the well-known increase in urban O3 and higherurban NO decreasing slopes compared with those of NO2 . The mostintensive O3 episodes in the Vic Plain are caused by (i) a relativelyhigh regional background O3 (due to a mix of continental,hemispheric–tropospheric and stratospheric contributions); by (ii) intensivesurface fumigation from mid-troposphere high O3 upper layers arisingfrom the concatenation of the vertical recirculation of air masses; but alsoby (iii) an important O3 contribution from the northwardtransport/channeling of the pollution plume from the BMA. The high relevanceof the local-daily O3 contribution during the most intense pollutionepisodes is clearly supported by the O3 (surface concentration) and NO2 (OMI data) data analysis. A maximum decrease potential (by applying short-term measures to abateemissions of O3 precursors) of 49  µ g  O3  m −3 (32 %) of the average diurnal concentrations was determined. Structurallyimplemented measures, instead of episodically, could result in importantadditional O3 decreases because not only the local O3 comingfrom the BMA plume would be reduced, but also the recirculated O3 andthus the intensity of O3 fumigation in the plain. Therefore, it ishighly probable that both structural and episodic measures to abate NOx and volatile organic compound (VOC) emissions in the BMAwould result in evident reductions of O3 in the Vic Plain.

atmospheric chemistry and physics

2005–2017 ozone trends and potential benefits of local measures as deduced from air quality measurements in the north of the Barcelona metropolitan area