Sources of water-soluble organic carbon in fine particles at a southern European urban background site

In this study, the temporal evolution and sources of water-soluble organic carbon (WSOC) in submicron particles at an urban background site in Elche (Spain) were investigated. Measurements of PM1 (N = 200) were carried out over one year (2021). Samples were analysed for organic carbon (OC), elemental carbon (EC), WSOC, levoglucosan, elements and major ions. A positive matrix factorization (PMF) analysis was performed in order to identify the sources of WSOC on an annual and a monthly basis. During the study period, traffic restrictions due to COVID-19 led to lower concentrations of PM1 and carbonaceous compounds than expected. The WSOC annual average mass concentration was 0.95 mugm-3, with maximum values during the colder months. The apportionment results indicate that the biomass burning (BB) source contributed 30.63% to WSOC levels, road traffic (RT) accounted for 23.90% of the WSOC, while the contribution of a source related to secondary organic aerosol formation (ammonium sulfate-AS) was 33.80%. Minor sources of WSOC were: soil dust (SD) and secondary nitrate (SN), which contributed 7.44% and 4.22%, respectively, to WSOC concentrations. The WSOC/OC ratio did not exhibit significant variations during the study period, since source contributions were similar for WSOC and OC. The highest values of this ratio were recorded in summer, due to the higher contribution from the AS source to WSOC concentrations.Copyright © 2023 The Authors

Elderly people's experience facing social isolation in the COVID-19 pandemic

Objective: to unveil the experience of the elderly with social isolation in the pandemic of COVID-19. Methods: qualitative study, with 14 elderlies in social isolation. The content was recorded and processed using the software Interface de R pour les Analyses Multidimensionnelles de Textes et de Questionnaires. Results: six classes were obtained, the first focused on spirituality and pre-pandemic pleasurable activities;the second was related to missing the extra-household routine and family life;the third, to the construction of a new routine;the fourth, to the strategies adopted for the prevention of COVID-19;the fifth, to the signs/symptoms experienced during the infection;and the sixth class, to the fear of dying. Conclusion: the experience of the elderly was permeated by the adaptation of routine, adoption of preventive measures and feelings of anguish in the face of uncertainties.