The chemical characterization and source apportionment of PM2.5 and PM10 in a typical city of Northeast China

Factor analysis and risk assessment of indoor environmental parameters and TSV in fitness centres under different zones, exercise intensities and times

“…During this time, the outdoor PM 2.5 concentrations in the Northeast region of China were found to be significantly higher than the national standards limit, as indicated by previous studies. 25,26 Since the front desk area was in close proximity to the entrances and exits of the fitness centre, it exhibited higher PM 2.5 concentration levels. Furthermore, the PM 2.5 concentrations in other areas of the fitness centre also exceeded the national limit of 0.075 mg/m 3 .…”

“…36 Rotko et al 40 found that perceived annoyance was highly correlated with mean indoor PM 2.5 concentrations (11.8 -90.3 μg/m 3 ) at work. Wu et al 41 analysed the effect of expected PM 2.5 concentrations (10,25,35,50 and 75 μg/m 3 ) on occupants' satisfaction and found that there was a significant effect of PM 2.5 concentrations on occupants' satisfaction. To ensure better indoor air quality and improve people's health through fitness exercise, it is important to effectively control the variations in indoor CO 2 , CH 2 O, TVOC and PM 2.5 levels.…”