Concentration and Size of Airborne Particulates in Woodworking Shops

Abstract

Wood secondary processing operations generate large amounts of airborne particulates. Inhalation of this material can lead to the development of work-related respiratory diseases. The Brazilian legislation does not define threshold limit values for airborne wood particles, and local studies are required to provide a technical basis for establishing these limits by regulation. This study aimed to determine the concentration and size of airborne wood particles of Eucalyptus spp. in woodworking shops. Analysis of the concentration of airborne particles was carried out using a gravimetric sampling pump and collector filters. The size of airborne particles was determined using microscope slides and an optical microscope coupled to an image capture system. Air samples were collected near different machines (belt sander, table saw, and band saw) at five woodworking shops located in the state of Espírito Santo, Brazil. Of the three machines, the belt sander produced the most harmful type of particulate matter: the small size of these particles allows their deposition deep into the respiratory tract. Particulate matter was above the threshold limit value established by international standards. To prevent the risk of severe health effects, there is an urgent and imperative need to reduce worker exposure levels (by the use of collective and personal protective equipment) as well as for the implementation of specific regulations that define particulate exposure limits for the wood sector in Brazil.

Monitoring indoor exposure to combustion-derived particles using plants

“…The plant near the milling machine captured a low amount of CDPs. Although during wood shaving large quantities of PM are produced (Barbosa et al, 2018), it does not include a combustion process and almost no CDPs are generated and emitted. Normalizing for the volume of the living room with the wood stove, only changed the ranking with the gas stove (SI, Figure S7 and tables S6 and S7), future leaf monitoring studies should take into account the volume and the ventilation of the room wherein the source is located.…”

Relationship between employees’ perception of airborne wood dust and ventilation applications in micro-scale enterprises producing furniture

“…When the mechanisms used by the respiratory system to clean and protect itself are overloaded, excessive inhalation of the dust can cause various health effects. The severity of these effects varies depending on the chemical composition of the inhaled dust, the density of the particles in the air suspension, the storage location of dust in the respiratory system and duration of exposure (Barbosa et al 2018). The American Conference of Industrial Hygienists (ACGIH) set a threshold limit value (TLV) of exposure to hardwood as 1 mg per 1 m 3 of air.…”