A systematic literature review and bibliometric analysis of sources and analytical approaches of indoor microplastics

This systematic review and bibliometric analysis offer a comprehensive exploration of microplastics(MPs)in indoor air environments up to 2023.This article provides robust insights into the most recent advancements,source identification,and suitable analytical methodologies for emergent indoor pollutants.The systematic review was performed according to PRISMA guidelines.The selection procedure involved searching three prestigious journal databases,Web of Science,Scopus,and PubMed,with a variety of search queries and stringent inclusion and exclusion criteria.The bibliometric analysis provides a quantitative assessment of the global research output,revealing a notable upsurge in scholarly activity commencing in 2017,potentially catalysed by the heightened awareness of indoor air quality issues amid the COVID-19 pandemic.Key publication sources,such as“Science of the Total Environment”and“Environmental Pollution,”are outlined to shed light on the academic conduits in this field.In addition,the analysis reveals a hierarchy of research output,with China at the top of the list,followed by Australia,Iran,and Spain.Collaborative research efforts between the United States and China have become a prominent feature of the research landscape as a result of this prolific output.The review highlights the need for standardised protocols in the collection,preparation,and examination of indoor MP samples.The significant role ventilation systems play in the dispersion dynamics of MPs in confined spaces is evaluated.Regarding the prospective sources and properties of indoor MPs,this review's findings can raise awareness among architects,interior designers and product designers,as well as researchers.

Submicron particle-bound polycyclic aromatic hydrocarbons in the Polish teaching rooms： Concentrations, origin and health hazard

The goal of the work was to investigate the concentrations of the 16 US EPA priority polycyclic aromatic hydrocarbons（PAH） bound to submicrometer particles（particulate matter, PM1） suspended in the air of university teaching rooms and in the atmospheric air outside. Two teaching rooms were selected in two Polish cities, Gliwice, southern Poland,and Warsaw, central Poland, differing with regard to the ambient concentrations and major sources of PM and PAH. The variabilities of indoor and outdoor 24-hr concentrations of PM1-bound PAH, the ratio（I/O） of the indoor to outdoor 24-hr concentrations of PM1-bound PAH, probable sources of PAH and the level of the hazard from the mixture of the 16 PAH（ΣPAH） to humans at both sites were analyzed. In both Warsaw and Gliwice, the mean concentrations of PM1-bound ΣPAH were slightly higher in the atmospheric air than in the rooms. The indoor and outdoor concentrations of individual PAH in Gliwice were correlated,in Warsaw – they were not. Most probably, the lack of the correlations in Warsaw was due to the existence of an unidentified indoor source of gaseous PAH enriching PM1 in phenanthrene, fluorene, and pyrene. Although the ambient concentrations of PM1-bound PAH were low compared to the ones observed earlier at both sites, they were much higher than in other urbanized European areas. However, because of low mass share of heavy PAH in ΣPAH, the various indicators of the health hazard from the 16 PAH mixture were low compared to other regions.