https://www.scipedia.com/wd/index.php?action=history&feed=atom&title=Gerasopoulos_et_al_2020a 2026-04-30T23:43:51Z Revision history for this page on the wiki MediaWiki 1.27.0-wmf.10 https://www.scipedia.com/wd/index.php?title=Gerasopoulos_et_al_2020a&diff=213156&oldid=prev 2021-02-12T15:14:00Z

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<p>Created page with &quot; == Abstract == The lockdown measures implemented worldwide to slow the spread of the COVID–19 pandemic have allowed for a unique real–world experiment, regarding the imp...&quot;</p> <p><b>New page</b></p><div><br /> == Abstract ==<br /> <br /> The lockdown measures implemented worldwide to slow the spread of the COVID–19 pandemic have allowed for a unique real–world experiment, regarding the impacts of drastic emission cutbacks on urban air quality. In this study we assess the effects of a 7–week (23 March–10 May, 2020) lockdown in the Greater Area of Athens, coupling in situ observations with estimations from a meteorology–atmospheric chemistry model. Measurements in central Athens during the lockdown were compared with levels during the pre– and post–lockdown 3–week periods and with respective levels in the four previous years. We examined regulatory pollutants as well as CO&lt;sub&gt;2&lt;/sub&gt;, black carbon (BC) and source–specific BC components. Models were run for pre–lockdown and lockdown periods, under baseline and reduced–emissions scenarios. The in–situ results indicate mean concentration reductions of 30–35% for traffic–related pollutants in Athens (NO&lt;sub&gt;2&lt;/sub&gt;, CO, BC from fossil fuel combustion), compared to the pre–lockdown period. A large reduction (53%) was observed also for the urban CO&lt;sub&gt;2&lt;/sub&gt; enhancement while the reduction for PM&lt;sub&gt;2.5&lt;/sub&gt; was subtler (18%). Significant reductions were also observed when comparing the 2020 lockdown period with past years. However, levels rebounded immediately following the lift of the general lockdown. The decrease in measured NO&lt;sub&gt;2&lt;/sub&gt; concentrations was reproduced by the implementation of the city scale model, under a realistic reduced–emissions scenario for the lockdown period, anchored at a 46% decline of road transport activity. The model permitted the assessment of air quality improvements on a spatial scale, indicating that NO&lt;sub&gt;2&lt;/sub&gt; mean concentration reductions in areas of the Athens basin reached up to 50%. The findings suggest a potential for local traffic management strategies to reduce ambient exposure and to minimize exceedances of air quality standards for primary pollutants.<br /> <br /> Document type: Article<br /> <br /> == Full document ==<br /> &lt;pdf&gt;Media:Draft_Content_315491324-beopen545-1376-document.pdf&lt;/pdf&gt;<br /> <br /> <br /> == Original document ==<br /> <br /> The different versions of the original document can be found in:<br /> <br /> * [https://hal.archives-ouvertes.fr/hal-03032282 https://hal.archives-ouvertes.fr/hal-03032282]<br /> <br /> * [https://hal.archives-ouvertes.fr/hal-03032282 https://hal.archives-ouvertes.fr/hal-03032282],<br /> : [https://hal.archives-ouvertes.fr/hal-03032282/document https://hal.archives-ouvertes.fr/hal-03032282/document],<br /> : [https://hal.archives-ouvertes.fr/hal-03032282/file/atmosphere-11-01174-v2.pdf https://hal.archives-ouvertes.fr/hal-03032282/file/atmosphere-11-01174-v2.pdf]<br /> <br /> * [https://www.mdpi.com/2073-4433/11/11/1174 https://www.mdpi.com/2073-4433/11/11/1174],<br /> : [https://doaj.org/toc/2073-4433 https://doaj.org/toc/2073-4433]<br /> <br /> * [https://www.mdpi.com/2073-4433/11/11/1174/pdf https://www.mdpi.com/2073-4433/11/11/1174/pdf],<br /> : [http://dx.doi.org/10.3390/atmos11111174 http://dx.doi.org/10.3390/atmos11111174] under the license https://creativecommons.org/licenses/by/4.0/<br /> <br /> * [https://www.mdpi.com/2073-4433/11/11/1174/pdf https://www.mdpi.com/2073-4433/11/11/1174/pdf],<br /> : [https://www.mdpi.com/2073-4433/11/11/1174 https://www.mdpi.com/2073-4433/11/11/1174],<br /> : [https://academic.microsoft.com/#/detail/3096474912 https://academic.microsoft.com/#/detail/3096474912]</div>

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