20.500.12556/DKUM-92059 How the volume of traffic affected air quality during the extreme event of COVID-19 lockdown in a small city The extreme traffic measures during the COVID-19 lockdown provided a unique opportunity to gain better insight into the relationship between traffic characteris-tics and NO2 concentrations in Maribor, a small Slove-nian city. NO2, traffic and meteorological data were sta-tistically processed in detail for March and April 2018, 2019 and 2020 to get a historical insight and to exclude the specifics of the lockdown period. The extreme event resulted in an average reduction of road traffic of 42%. The decrease in the number of passenger cars ranged from 33.9 to 60.3% per day with the largest decrease on the motorway. Daily averages of heavy goods traffic de-clined on the motorway and the expressway by 24.6% and 7%, respectively. Traffic characteristics were reflect-ed in a 24–27% decrease in NO2 concentrations at the urban station. The change is smaller than the change in traffic volume, which could be explained by the change in the composition of the vehicle fleet due to the increase in NO2-dominant traffic sources, e.g. diesel heavy goods vehicles. The presented results are relevant for improv-ing air quality and sustainable mobility management in small cities. They highlight the important role of reor-ganisation of heavy goods traffic in urban logistics. road traffic extreme event COVID-19 lockdown NO2 emissions meteorological conditions air pollution cestni promet ekstremni dogodek zaprtje zaradi Covida-19 emisije NO2 meteorološki pogoji onesnaževanje zraka true false true Fakultet prometnih znanosti, Fakulteta za pomorstvo in promet, Universita degli studi di Trieste, Istituto per lo studio dei transporti nell'integrazione economica europea, Fakultet za saobračaj i komunikacije, Fakulta prevadzky a ekonomiky dopravy a spojov, Dopravni fakulta Jana Pernera Angleški jezik Slovenski jezik https://traffic2.fpz.hr/index.php/PROMTT/index Copyright (c) 2022 Branka Trček, Rok Kamnik Članek v reviji 2025-03-13 13:44:51 2025-03-13 13:44:51 2025-03-14 03:27:41 0000-00-00 00:00:00 2022 0 0 str. 789-800 no. 5 Vol. 34 2022 0000-00-00 Zaloznikova Objavljeno NiDoloceno 2022-04-06 2022-06-08 2022-09-30 656.1:504.3 125451267 10.7307/ptt.v34i5.4143 0353-5320 10_4143-Trcek_4-Final.pdf 10_4143-Trcek_4-Final.pdf 1 F3B7A4B312937BFA0B5007A1449FEF80 cf4725818dd40ec1264f44c3db1ee1b604a3dd93e0ad7563fe6b9bb079e03112 86bd33d5-0009-11f0-82d0-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=189260 https://traffic2.fpz.hr/index.php/PROMTT/article/view/93 0 95f9db26-0009-11f0-82d0-00155d000105 https://dk.um.si/Dokument.php?lang=slv&id=189261 Fakulteta za gradbeništvo, prometno inženirstvo in arhitekturo 0 0 0