Mar 01 2021 · 1. Introduction. The problem of particulate matter (PM) emission by large boilers in power plants has been virtually solved and the removal efficiency of these devices higher than 99% has been achieved but small residential boilers and stoves still remain the main PM emitters in many countries particularly during the winter season.
Maintenance and ash removal workers were exposed to high inhalable dust concentrations inside biomass-fired boilers. The median air inhalable dust concentration in workers' breathing zones were 33 mg m (-3) and 120 mg m (-3) in ash removal and maintenance tasks respectively. The median concentration of manganese (0.31 mg m (-3)) exceeded the occupational exposure limit in worker's