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SOURCE APPORTIONMENT ANALYSIS IN PM AND O3 CONCENTRATIONS DURING COVID-19 LOCKDOWN PERIOD IN MADRID (SPAIN)
21st International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2022 ; 2022.
Article in English | Scopus | ID: covidwho-2207695
ABSTRACT
In a first analysis of the impacts of the reduction of anthropogenic emissions during COVID-19 lockdown over Madrid (Spain) area, we found an important NOx level reduction but the O3 and PM concentrations were increased. In this work the causes of the increments are studied using Source Apportionment Technology (SAT) included in the Comprehensive Air Quality Model with Extensions (CAMx) model. CAMx is driven by the Weather Research and Forecasting model (WRF). Two simulations are run one simulation considers the emission reductions during the lockdown (COVID simulation) and a second simulation,” business as usual” (BAU simulation) with an emissions scenario without restrictions. Source apportionment techniques are used to identify and quantify the contributions from main pollution sources with the purpose to provide understanding on what measures should be taken to address them and this work shows the potential of these technique. SAT was used to estimate the contributions of multiple sources, and pollutant types (NOx and VOC) to ozone and particle formation in a single model run. Differences in SAT results under baseline (BAU) and COVID scenarios are used to quantify the contributions of O3 and PM2.5 reductions associated with emissions reduction in individual sectors due to the lowered human activities with a high spatial resolution (1 km). Road transport is the main emission source reduced by the lockdown and reduction in NOx emissions (59%) is higher that VOC reduction (14%). This study helps to elucidate the complex and nonlinear response of O3 and PM concentrations after a reduction of emissions mainly from the transport sector, during the COVID-19 lockdown period, that must be taken into account in the control strategies to mitigate haze pollution. The results show that despite extreme reductions in primary emissions, current air pollution cannot be fully tackled. Further consideration needs to be given to the reorganisation of energy and industrial strategy together with trans-regional joint monitoring for a comprehensive long-term air pollution plan. Source apportionment studies can support of authorities responsible to develop air quality plans. © British Crown Copyright (2022)
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Collection: Databases of international organizations Database: Scopus Language: English Journal: 21st International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2022 Year: 2022 Document Type: Article

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Collection: Databases of international organizations Database: Scopus Language: English Journal: 21st International Conference on Harmonisation within Atmospheric Dispersion Modelling for Regulatory Purposes, HARMO 2022 Year: 2022 Document Type: Article