biostudies-literatureUnknown297Van Poppel MA mobile monitoring campaign was conducted (by bicycle) to assess the black carbon (BC) concentrations in Cluj-Napoca city, Romania, in 2020, before, during and after COVID-19 lock-down. Over the entire study period, the BC concentrations ranged between 1.0 and 25.9 μg/m³ (averaged per street section and period characterized by different traffic conditions). Marked spatial and temporal differences were observed. Observed differences in BC concentrations between locations are attributed to traffic intensities, with average BC concentrations, under normal circumstances, of 6.6-14.3 μg/m³ at roads with high to intense traffic, compared to 2.8-3.1 μg/m³ at areas with reduced traffic, such as residential areas, parks and pedestrian streets. The COVID-19 measures impacted traffic volumes, and heAtmospheric environment (Oxford, England : 1994)119594https://www.ebi.ac.uk/biostudies/studies/S-EPMC9837233biostudies-literatureMobile measurements of black carbon: Comparison of normal traffic with reduced traffic conditions during COVID-19 lock-down.PMC9837233Varaticeanu CVan Laer JLevei EAHoaghia MAMoldovan AMarmureanu LPeters JVan Poppel MfalseMobile measurements of black carbon: Comparison of normal traffic with reduced traffic conditions during COVID-19 lock-down.A mobile monitoring campaign was conducted (by bicycle) to assess the black carbon (BC) concentrations in Cluj-Napoca city, Romania, in 2020, before, during and after COVID-19 lock-down. Over the entire study period, the BC concentrations ranged between 1.0 and 25.9 μg/m³ (averaged per street section and period characterized by different traffic conditions). Marked spatial and temporal differences were observed. Observed differences in BC concentrations between locations are attributed to traffic intensities, with average BC concentrations, under normal circumstances, of 6.6-14.3 μg/m³ at roads with high to intense traffic, compared to 2.8-3.1 μg/m³ at areas with reduced traffic, such as residential areas, parks and pedestrian streets. The COVID-19 measures impacted traffic volumes, and he2023-01-01T00:00:00Z2023 Mar2026-03-31T10:37:46.787Z2024-12-04T00:23:12.972ZS-EPMC98372333668628510.1016/j.atmosenv.2023.119594