DOI: 10.18150/uud1y6
title: Air pollution in warm (May to August 2022) and cold (November 2022 to February 2023) seasons at urban sites in Vilnius (Lithuania) and Warsaw (Poland)

description: OverviewIn-situ measurements were conducted at two urban sites, the urban background site in Vilnius (Lithuania) and the urban site in Warsaw (Poland), for two campaigns: warm (May 1st, 2022, to August 18th, 2022) and cold (November 1st, 2022, to February 28th, 2023) seasons. The data were collected using aethalometers (AE33, Magee Scientific, at both sites) and nephelometers (TSI model 3563 in Vilnius and Ecotech Aurora 4000 in Warsaw). The instruments in Vilnius were installed at the rooftop (25 m a.b.l.) of Center for Physical Sciences and Technology (N54°43’ E25°19’). In Warsaw, the instruments were placed on a rooftop platform (20 m a.b.l.) of Warsaw Observatory Station of the Institute of Geophysics, Faculty of Physics, University of Warsaw (N52°13’ E 20°54’). Meteorological data in Warsaw were measured at the same location as the in-situ measurements. In Vilnius, the meteorological data was obtained via API access from the Lithuanian Meteorological Service data archives for Vilnius weather station (N54°37’ E25°6’), located 17.8 km away from the in-situ measurement site.Based on aethalometer measurements, black carbon (BC) source apportionment was performed using the aethalometer model (Sandradewi et al., 2008) to obtain fossil fuel combustion-derived BC (BCFF) and biomass burning-related BC (BCBB). For the cold season, the source apportionment included coal-burning contribution, and the analysis was done for BCFF and BC from biomass and coal-burning (BCBB, C). For the source apportionment, absorption Ångström exponent (AAE) values were selected as follows: in Warsaw AAEFF = 1, AAEBB = 2, in Vilnius AAEFF = 0.9, AAEBB = 2.2 for the warm season; in Warsaw AAEFF = 1.03, AAEBB, C = 1.93, in Vilnius AAEFF = 1.03, AAEBB, C = 1.93 for the cold season. For optical aerosol characterization, absorption Ångström exponent (AAE), scattering Ångström exponent (SAE), and single scattering albedo (SSA) were calculated. The scattering coefficients from nephelometers at both sites were corrected for truncation error using the method suggested by Müller et al. (2011). The calculation of these derived aerosol properties is described in Minderytė et al. (2023).The datasets in_situ_data_Vilnius_cold_season.csv, in_situ_data_Vilnius_warm_season.csv, in_situ_data_Warsaw_cold_season.csv, in_situ_data_Warsaw_warm_season.csv contain derived data from in-situ measurements:Date and time of measurement (in UTC)BC mass concentration (at 880 nm in µg/m3)BCFF mass concentration (at 880 nm in µg/m3)BCBB mass concentration (at 880 nm in µg/m3) Absorption Ångström exponent AAE (at 532/660 nm, unitless) Scattering Ångström exponent SAE (at 450/550 nm, unitless)Single scattering albedo SSA (at 550 nm, unitless)Meteorological data files meteo_data_Vilnius_cold_season.csv, meteo_data_Vilnius_warm_season.csv, meteo_data_Warsaw_cold_season.csv, meteo_data_Warsaw_warm_season.csv contain:Date and time of measurement (in UTC)Air temperature (in °C)Wind speed mean (in m/s)Precipitation (mm)--------------------------------------------------------------Sandradewi et al. 2008, doi: 10.1021/es702253mMüller et al. 2011, doi:10.5194/amt-4-1291-2011Minderytė et al. 2023, doi: 10.1016/j.heliyon.2023.e19652ATTENTION:We offer a free access to this dataset. The user is however encouraged to share the information on the data use with Remote Sensing Laboratory by sending an e-mail to rslab@fuw.edu.plIn the case this dataset is used for a scientific communication (publication, conference contribution, thesis) we would kindly ask to acknowledge this data provision by adding the following statement in Acknowledgments: "We acknowledge the data originators A. Minderytė, F.M. Hey, V. Dudoitis, W. Kumala, S. Byčenkienė and I.S.Stachlewska for the quality-assurance, evaluation, and provision of data sets of the Center for Physical Sciences and Technology (FTMC) in Vilnius and the Remote Sensing Laboratory at the Faculty of Physics of the University of Warsaw (RS-Lab UW)."