Exposure to and Acute Effects of Medium-Density Fiber Board Dust

The goals of this study were (1) to investigate workers' exposure to medium-density fiber (MDF) dust (inhalable dust, particle size), formaldehyde, and volatile organic compounds; (2) to study the possible inflammatory nasal reactions caused by exposure to MDF board dust; and (3) to determine the occurrence of irritative symptoms among exposed workers. Nasal lavage fluid was analyzed for cytokines and nitric oxide/nitrite, and inflammatory cells were counted. The time-weighted average of MDF dust was 1.4 mg/m 3 in the workers' breathing zones. MDF board dust was composed mainly of particles exceeding 10 μm in diameter. The MDF board dust released formaldehyde in concentration of about 1000 μ g/g when extracted with water for 6 hours at 37°C. The cell counts and cytokine levels of the nasal lavage fluid samples did not show statistically significant differences between the workers exposed to MDF board dust and those exposed to other wood dusts. Nevertheless, two MDF-exposed workers had a considerable incre...