Seasonal variation in indoor concentrations of air pollutants in residential buildings

Assessing the indoor air quality and their predictor variable in 21 home offices during the Covid-19 pandemic in Norway

“…This is probably due to reduced ventilation in winter to avoid the draft. This finding aligns with a previous study, where higher concentrations of CO 2 , CO, PM 10 , and PM 2.5 were measured during the winter compared to the summer [ 79 ]. Significantly higher concentrations of CO 2 were also measured during the winter in another study [ 80 ].…”

“…However, low CO 2 concentrations did not correspond to satisfactory indoor air quality [ 82 ]. In another study [ 79 ], the measured concentrations of PM 2.5 and PM 10 exceeded the WHO guidelines, while the concentration of CO 2 was below the WHO guidelines. In the measurements hereby presented, simultaneously with CO 2 concentrations below 1000 ppm, there were many occurrences of high concentrations of TVOC and formaldehyde.…”

Airborne bacterial and PM characterization in intensive care units: correlations with physical control parameters

“…Both Chamseddine et al ( 2019 ) and Zaman et al ( 2021 ) offered possible explanations for these seasonal variations; both cited that increased indoor activity during the cold season increased the rate of pollutants influx, ultimately causing the observed surges in concentrations. It should be noted that the impact of seasonality on indoor air quality is not limited to the hospital setting; several studies have reported similar observations for residential settings (Abdel-Salam 2021 ) and in learning institutions (Deng and Lau 2019 ; Stamp et al 2022 ). In comparison, the spatial variability of microorganism levels in hospitals remains less studied.…”

A systematic literature review on indoor PM2.5 concentrations and personal exposure in urban residential buildings

“…Baxter et al (2016) concluded that AER varied widely in different urban areas due to diversities in building characteristics, seasonal meteorological conditions, and occupant behaviors such as the application of air conditioning or opening windows. Kornartit et al, 2010;Wan et al, 2011;Shrubsole et al, 2012;Abdullahi et al, 2013;Morawska et al, 2013;Ciuzas et al, 2015;Logue et al, 2015;Zauli Sajani et al, 2015;Li et al, 2017b;Abdel-Salam, 2021b). Li et al (2017a) pointed that personal exposure to PM2.5 in winter is much higher than that in summer.…”