Levels Of Wood Dust Research Articles

Respiratory Effects and Pulmonary Functions Related to Wood Dust Exposure among Workers in a Rubber Wood Factory

This study aimed to determine the effects of wood dust exposure on respiratory symptoms and pulmonary functions in wood dust factory workers and the association between wood dust exposure and pulmonary functions. This cross-sectional study comprised of one hundred workers who answered a self-reported questionnaire. Two factory areas, the production department and the back office, were explored using stationary air sampling. The wood dust concentration was collected using NIOSH Method 0600. Pulmonary function parameters were evaluated through spirometry. A descriptive statistics analysis was done for personal information. Binary logistic regression determined the association between wood dust exposure and respiratory symptoms. The prevalence of respiratory symptoms related to wood dust exposure at work was 49.00 percent. Three major symptoms in the exposed group includes chest pain, shortness of breath, and asthma. The average amount of PM10 in the saw mill area was significantly higher than in the back office (7.23 vs. 1.60 mg/m3). There was a significant difference in forced expiratory capacity between the reference and exposure groups (mean difference = -4.03, p-value = 0.011). The adjusted odd ratio showed that the high wood dust-exposed group had a lower runny nose and dry cough than the reference group. All workers need to consider using personal protective equipment with appropriate specifications in the sawmill area and also the other areas where wood dust levels are high. To control the concentration of respirable particles, resource and pathway control must be applied to reduce the concentration of respirable particles in the workplace.

Wood Dust and Risk of Leukemia: A Protocol of Systematic Review and Meta-Analysis

Background: Leukemia is a type of cancer caused by the growth of blood cells, especially in the bones and blood. Although extensive research has investigated various environmental factors that increase the risk of leukemia, the relationship between dust exposure and leukemia remains a topic of interest. Wood dusting is a common activity in industries such as carpentry and woodworking, and its potential link to leukemia warrants a comprehensive review to evaluate the available evidence. Understanding this organization is important for occupational health and safety advice and will assist in prevention strategies for those at risk. Methods: We conducted a systematic review and analysis of the existing literature on the relationship between wood dust and leukemia. A comprehensive search of electronic databases, including PubMed, Scopus, and Web of Science, was conducted to identify relevant studies up to the date of review. Methods included peer-reviewed literature, cohort studies, case-control studies, and meta-analyses of peer-reviewed studies such as chip injury and leukemia. Priority will be given to studies with clear evaluation criteria and strong analytical ability. Results: The review identified a total of [X] studies that met the inclusion criteria. These studies reveal different groups of people and workplaces with different levels of wood dust. The extracted data showed various associations between wood dust and leukemia, including positive, negative or neutral effects. Meta-analyses were conducted to provide a synthesis of the available evidence. Subgroup analysis was based on characteristics such as study design, population characteristics, and dust levels. A sensitivity analysis was performed to evaluate the effectiveness of all outcomes. Potential sources of heterogeneity between studies were explored and the quality of evidence was assessed by design.

Effect of Respiratory Muscle Stretch Gymnastics on Chest Expansion and Peak Expiratory Flow Rate among Sawmill Workers

Introduction: Sawmill workers are subjected to high levels of wood dust, which can significantly impair lung function. Many studies have found restrictive abnormalities associated with decreased breathing muscle strength and chest expansion. Respiratory muscle stretch gymnastics (RMSG) has been proposed as an additional form of rehabilitation for patients suffering from respiratory diseases. RMSG is intended to reduce chest wall stiffness, particularly in the respiratory muscles of the chest wall. Objective: The objective of this study was to look into the impact of RMSG on chest expansion and peak expiratory flow rate (PEFR) in sawmill workers. Methodology: Fifty randomly selected sawmill workers aged 30–50 years in Chidambaram town were given RMSG training twice daily, four times each of five patterns for 4 weeks. A structured questionnaire was used to interview the subjects. Height, weight, and chest measurements were all part of the physical examination. Before and after training, the physiological parameter PEFR was measured. The extent of chest expansion was the primary outcome measure. Data Analysis and Outcomes: The Statistical Package for Social Sciences (SPSS) version 16 was used to evaluate and analyze the data, with the level of significance set at P < 0.05. The dependent t-test revealed a significant difference in chest expansion between pre- and posttraining (2.441.11) and (3.780.616) with a P = 0.001. At P = 0.001, there was also a statistically significant difference in the mean values of PEFR (341.80 77.13) and (479.8058.24). Conclusion: The study found that RMSG training improves chest expansion and pulmonary function (PEFR). According to the findings, RMSG is a simple, safe, and effective technique for increasing the overall functional capacity of sawmill workers. Our study clearly demarcates the difference in an angle that 40° or 45° recumbency is useful. With not much literature in such workers, we can say that this study is one of the early works in this field.

Correlation Between Wood Dust Levels with Interleukin-8 in Blood Serum Wood Processing Workers at X Company, Tanjung Morawa

Backgrounds: Wood dust exposure can stimulate proinflammatory cytokines and increase IL-8 levels, which is a foreign body in the body will be phagocytosis by macrophages and excrete mediators such as chemokines, cytokines, and chemoattractants which can cause inflammation. Duration of exposure, number and size of wood dust in the respiratory tract of wood industry workers are associated with various pulmonary disorders such as, COPD, occupational asthma, allergic rhinitis, decreased pulmonary function and pulmonary fibrosis. The aim this study is determine correlation between wood dust levels with interleukin-8 in blood serum among wood processing workers at x company, Tanjung Morawa-North Sumatera.
 Methods: A cross-sectional study which involved 40 workers from 3 different locations namely cutting, sanding and drafting. Cumulative wood dust exposure was calculated by measuring the dust content at the work site using Dusttrak TSI. IL-8 serum levels were measured using the ELISA technique. The Spearman correlation test was used.
 Results: Out of 40 workers those who worked in the cutting section were 15 people (37,5%), sanding section were 15 people (37,5%) and drafting section were 10 people (25%). The average level of wood dust PM 2,5 was 5,23 mg/m3while PM10 was 8,24 mg/m3 and the mean level of IL-8 in serum was 163,3 ng/L. This study find that there is a strong correlation between wood dust and IL-8 serum (r = 0,683; p

Worker Characteristics and Dust Exposure to Pulmonary Function Status in Jumping Saw Division Of Wood Industry At Banyuwangi: An Association Study

Wood dust in the air will bring serious health problems if it is prolonged. Wood Dust has effect for health due to its effect on , pulmonary function via respiratory system entrance. The aim of this study was to analyze the association of worker characteristics and dust exposure to pulmonary function status in jumping saw division workers in wood industry Sempu, Banyuwangi. The research was observasional with cross sectional desain. Research data was obtained by giving questionnaire to respondent, measurement of dust level by using HVAS and lung physiology examination using spirometry tool. The sampel in this research was 7 workers in the part of jumping saw and 6 worker in the part of office. Data were analyzed with chi square statistical test to analyzing the association and statistical t-test to analyzing difference pulmonary function status between to 2 groups. The result showed that dust level in the exposure groups of jumping saw workers was 19,90 mg/m3 and non-exposure group (office) was 0,089 mg/m3, suitable with Permenakertrans No. 13/MEN/X/2011 is 5 mg/m3. Results of lung function measurement showed that normal 15,38% and impairment 84,62%. It is concluded that no associoation between age, length of employment, smoking habit, respiratory ptotective equipment usage habit, respiratory diseases history and dust exposure to pulmonary function status, except association between nutrion status with pulmonary function status. The company should monitor the levels of wood dust, to ensure that it does not exceed the NAB and regular lung physiological health checks.

PENGARUH KADAR DEBU KAYU TERHADAP KELUHAN PERNAFASAN PEKERJA (Studi Kasus di Home Industry Rebana Dusun Kaliwot Desa Bungah Kecamatan Bungah Kabupaten Gresik Tahun 2016)

ABSTRACTBungah is a village and sub-district in Gresik Regency, East Java province, Indonesia. DesaBungah is well-known as a center of production for „kopyah‟ (a local term for cap) and tambourines. Sincethe 50s the people of Bungah made the business of producing tambourines as their livelihood. Thisbusiness continues to grow along with the increasing number of tambourine craftsmen, mainly found inwestern part of Bungah in Dusun Kaliwot. Currently, tambourines made in Bungah already spread toalmost all parts of Indonesia. The purpose of the present study was to determine the effects of the levelsof wood dust on workers‟ respiratory complaints.This is an analytic study, that attempts to explore how and why a health phenomenon occur.Subsequently, it analyzes the dynamics of correlation between the risk and effect factors.Results showed that the individual level of dust measured in 38 workers of tambourine homeindustry in Dusun Kaliwot was eligible (52.6%). Furthermore, most of those 38 workers had severerespiratory complaints (36.8%).The owners of tambourine home industry are recommended to provide their workers with masksto minimize dust exposure and to prohibit smoking at work. Workers are expected to wear masks and notsmoke during working hours. The Office of Industry and Trade is expected to monitor and control thelevels of dust in the workplace. Future researchers are expected to investigate the ambient dust levelsaround the home industry.Keywords : Tambourine home industry, levels of wood dust, respiratory complaints

Respiratory symptoms and lung function in relation to wood dust and monoterpene exposure in the wood pellet industry

Introduction: Wood pellets are used as a source of renewable energy for heating purposes. Common exposures are wood dust and monoterpenes, which are known to be hazardous for the airways. The purpose of this study was to study the effect of occupational exposure on respiratory health in wood pellet workers.Materials and methods: Thirty-nine men working with wood pellet production at six plants were investigated with a questionnaire, medical examination, allergy screening, spirometry, and nasal peak expiratory flow (nasal PEF). Exposure to wood dust and monoterpenes was measured.Results: The wood pellet workers reported a higher frequency of nasal symptoms, dry cough, and asthma medication compared to controls from the general population. There were no differences in nasal PEF between work and leisure time. A lower lung function than expected (vital capacity [VC], 95%; forced vital capacity in 1 second [FEV1], 96% of predicted) was noted, but no changes were noted during shifts. There was no correlation between lung function and years working in pellet production. Personal measurements of wood dust at work showed high concentrations (0.16–19 mg/m3), and exposure peaks when performing certain work tasks. Levels of monoterpenes were low (0.64–28 mg/m3). There was no association between exposure and acute lung function effects.Conclusions: In this study of wood pellet workers, high levels of wood dust were observed, and that may have influenced the airways negatively as the study group reported upper airway symptoms and dry cough more frequently than expected. The wood pellet workers had both a lower VC and FEV1 than expected. No cross-shift changes were found.

Impact of exposure to wood dust on genotoxicity and cytotoxicity in exfoliated buccal and nasal cells.

Wood dust was classified by the IARC as a human carcinogen which causes sinonasal tumours. However, the exposure in different industries varies strongly and the risks of workers depend on the specific situation which can be assessed by the use of biomonitoring methods. The aim of this study was to investigate the workers who are exposed to low dust levels (below the permitted concentrations) with cytogenetic and biochemical methods. Micronuclei (MNi) which are indicative for genomic damage, nuclear buds which reflect gene amplification, binucleated cells which are caused by mitotic disturbances and acute cytotoxicity parameters (pyknosis, karyorrhexis, condensed chromatin, karyolysis) were monitored in buccal and nasal cells of workers of a veneer factory (n = 51) who are exposed to volatile wood-derived compounds, in carpenters of a furniture factory which use no synthetic chemicals (n=38) and in a control group (n = 65). Additionally, markers were measured in blood plasma which reflect inflammations (C-reactive protein, CRP) and the redox status, namely malondialdehyde (MDA) and oxidised low density proteins (oxLDL). No induction of micronucleated cells was observed in both epithelia in the two exposure groups while all other nuclear anomalies except pyknosis were increased; also one health-related biochemical marker (MDA) was significantly elevated in the workers. Taken together, the results of our study show that exposure to low levels of wood dust does not cause formation of MNi indicating that the cancer risks of the workers are not increased as a consequence of genetic damage while positive results were obtained in earlier studies with workers who are exposed to high dust levels. However, our findings indicate that wood dust causes cytotoxic effects which may lead to inflammations.

Cross-shift and longitudinal changes in FEV1 among wood dust exposed workers

ObjectivesAcute lung function (LF) changes might predict an accelerated decline in LF. In this study, we investigated the association between cross-shift and longitudinal changes in forced expiratory volume in 1...

THE MEASUREMENT AND DISTRIBUTION OF WOOD DUST

In Italy, the woodworking industry presents many issues in terms of occupational health and safety. This study on exposure to wood dust could contribute to the realization of a prevention model in order to limit exposure to carcinogenic agents to the worker. The sampling methodology illustrated the analysis of dust emissions from the woodworking machinery in operation throughout the various processing cycles. The quantitative and qualitative assessment of exposure was performed using two different methodologies. The levels of wood dust were determined according to EN indications and sampling was conducted using IOM and Cyclon personal samplers. The qualitative research of wood dust was performed using an advanced laser air particle counter. This allowed the number of particles present to be counted in real time. The results obtained allowed for an accurate assessment of the quality of the dust emitted inside the workplace during the various processing phases. The study highlighted the distribution of air particles within the different size classes, the exact number of both thin and ultra-thin dusts, and confirmed the high concentration of thin dust particles which can be very harmful to humans.

Rubberwood Dust and Lung Function among Thai Furniture Factory Workers

The objective of this study was to assess factors affecting lung function among 685 workers in the rubberwood (Hevea brasiliensis) furniture industry in the Chonburi and Rayung provinces of eastern Thailand. Study data were gathered using questionnaires, by sampling wood dust, and by spirometry. The mean wood dust exposure level in the factories was 4.08 mg/m3 (SD = 1.42, range: 1.15-11.17 mg/m3). The mean overall percent of predicted forced vital capacity (FVC), forced expiratory volume in one second (FEV1), and FEV1/FVC values were 84 % (SD = 13.41), 86% (SD = 14.40), and 99% (SD = 10.42), respectively. Significant negative correlations were found between mean dust exposure levels and FVC (p = 0.0008), and FEV1/FVC% (p > 0.001), but not FEV1 (p = 0.074). An association between decline in lung function and wood dust levels among wood workers suggests that rubberwood dust exposure negatively affects lung function.

Rubberwood Dust and Lung Function among Thai Furniture Factory Workers

The objective of this study was to assess factors affecting lung function among 685 workers in the rubberwood (Hevea brasiliensis) furniture industry in the Chonburi and Rayung provinces of eastern Thailand. Study data were gathered using questionnaires, by sampling wood dust, and by spirometry. The mean wood dust exposure level in the factories was 4.08 mg/m3 (SD = 1.42, range: 1.15-11.17 mg/m3). The mean overall percent of predicted forced vital capacity (FVC), forced expiratory volume in one second (FEV1), and FEV1/FVC values were 84 % (SD = 13.41), 86 % (SD = 14.40), and 99% (SD = 10.42), respectively. Significant negative correlations were found between mean dust exposure levels and FVC (p = 0.0008), and FEV1/FVC% (p < 0.001), but not FEV1 (p = 0.074). An association between decline in lung function and wood dust levels among wood workers suggests that rubberwood dust exposure negatively affects lung function.

Wood Dust Levels in Alberta Sawmills

ABSTRACT Sawmills in the Canadian province of Alberta were surveyed in order to identify occupations at greatest risk and to guide compliance measures. Two hundred and ten wood dust samples (inhalable) were collected from nine Alberta sawmills using Institute of Occupational Medicine (IOM) personal samplers. Nine percent of samples exceeded 5 mg/m3 8-hour time-weighted average (TWA) for total dust. There was a significant statistical difference (p < .001) between the median and geometric mean inhalable particulate matter (IPM) dust levels for 4 aggregated occupational groups. Levels were highest for cleanup workers (3.5 mg/m3), followed by the maintenance, planermill, and sawmill occupational groups, as were other measures of dust levels. In response to these findings, the Alberta Forest Products Association undertook a program to train sawmill managers to implement these recommendations on engineering controls, administrative controls, and personal protective equipment.

Variability and Determinants of Wood Dust and Resin Acid Exposure during Wood Pellet Production: Measurement Strategies and Bias in Assessing Exposure–Response Relationships

Production of wood pellets is a relatively new and expanding industry in which the exposure profiles differ from those in other wood-processing industries like carpentries and sawmills where there are lower levels of wood dust. Sixty-eight personal exposure measurements of wood dust (inhalable and total dust) and resin acids were collected for 44 participants at four production plants located in Sweden. Results were used to estimate within- and between-worker variability and to identify uniformly exposed groups and determinants of exposure. In addition, overexposure, whether the risk of the long-term mean exposure of a randomly selected worker exceeding the occupational exposure limit is acceptably low, was calculated as well as the underestimation of the exposure-response relationship (attenuation). Greater variability in exposure between work shifts than between workers was observed with the within-worker variation accounting for 57-99% of the total variance in the individual-based model. Several uniformly exposed groups were detected but were mostly associated with a between-worker variation of zero which is an underestimation of the between-worker variation but an indication of uniformly exposed groups. Cleaning was identified as a work task that increases exposure slightly; so reducing workers' exposure during this operation is advisable. The levels of wood dust were high and were found to pose unacceptable risks of overexposure at all plants for inhalable dust and at three out of four plants for total dust. These findings show that exposure to dust needs to be reduced in this industry. For resin acids, the exposure was classed as acceptable at all plants. According to an individual-based model constructed from the data, the level of attenuation was high, and thus there would be substantial bias in derived dose-response relationships.

Exposure assessment to alpha- and beta-pinene, delta(3)-carene and wood dust in industrial production of wood pellets.

The main aim of the study was to measure the exposure to monoterpenes (alpha- and beta-pinene and Delta(3)-carene) and wood dust during industrial production of wood pellets and briquettes. Additional aims were to compare the results from wood dust sampled on a filter with real time measurements using a direct reading instrument and to identify peak exposures to dust. Twenty-four men working at six companies involved in industrial production of wood pellets and briquettes participated in the study. Monoterpenes were measured by diffusive sampling and wood dust was measured as total dust. A data logger (DataRAM) was used for continuous monitoring of dust concentration for 18 of the participants. The sampling time was approximately 8 h. The personal exposure to monoterpenes ranged from 0.64 to 28 mg/m(3) and a statistically significant (Kruskal-Wallis test, P = 0.0002) difference in levels of monoterpenes for workers at different companies was seen. In the companies the personal exposure to wood dust varied between 0.16 and 19 mg/m(3) and for 10 participants the levels exceeded the present Swedish occupational exposure limit (OEL) of 2 mg/m(3). The levels of wood dust during the morning shift were significantly (Mann-Whitney test, P = 0.04) higher compared with the afternoon shift. Continuous registration of dust concentration showed peak values for several working operations, especially cleaning of truck engines with compressed air. For 24 workers in six companies involved in industrial production of wood pellets the personal exposure to monoterpenes was low and to wood dust high compared with the present Swedish OEL and previous studies in Swedish wood industries. Since the DataRAM can identify critical working tasks with high wood dust exposure a reduction in exposure levels could probably be achieved by changes in working routines and by the use of protective equipment.

Sample size considerations for studies of intervention efficacy in the occupational setting.

Due to a shared environment and similarities among workers within a worksite, the strongest analytical design to evaluate the efficacy of an intervention to reduce occupational health or safety hazards is to randomly assign worksites, not workers, to the intervention and comparison conditions. Statistical methods are well described for estimating the sample size when the unit of assignment is a group but these methods have not been applied in the evaluation of occupational health and safety interventions. We review and apply the statistical methods for group-randomized trials in planning a study to evaluate the effectiveness of technical/behavioral interventions to reduce wood dust levels among small woodworking businesses. We conducted a pilot study in five small woodworking businesses to estimate variance components between and within worksites and between and within workers. In each worksite, 8 h time-weighted dust concentrations were obtained for each production employee on between two and five occasions. With these data, we estimated the parameters necessary to calculate the percent change in dust concentrations that we could detect (alpha = 0.05, power = 80%) for a range of worksites per condition, workers per worksite and repeat measurements per worker. The mean wood dust concentration across woodworking businesses was 4.53 mg/m3. The measure of similarity among workers within a woodworking business was large (intraclass correlation = 0.5086). Repeated measurements within a worker were weakly correlated (r = 0.1927) while repeated measurements within a worksite were strongly correlated (r = 0.8925). The dominant factor in the sample size calculation was the number of worksites per condition, with the number of workers per worksite playing a lesser role. We also observed that increasing the number of repeat measurements per person had little benefit given the low within-worker correlation in our data. We found that 30 worksites per condition and 10 workers per worksite would give us 80% power to detect a reduction of approximately 30% in wood dust levels (alpha = 0.05). Our results demonstrate the application of the group-randomized trials methodology to evaluate interventions to reduce occupational hazards. The methodology is widely applicable and not limited to the context of wood dust reduction.

Exposure to dust, resin acids, and monoterpenes in softwood lumber mills.

A study to assess exposure to potential respiratory hazards in a large lumber mill processing spruce (Picea engelmannii and glauca), pine (Pinus contorta), and fir (Abies lasiocarpa) used a random sampling strategy to assess exposures for all jobs in the sawmill, planer mills, and yard. Personal samples for inhalable particulate were collected to measure exposure to dust and resin acids (abietic acid and pimaric acid). To estimate wood dust exposure, rather than overall dust, the resin acid content within dust was used in combination with observations of job tasks and proximity to dust sources. Passive dosimeters were used to measure exposure to alpha-pinene, beta-pinene, delta3-carene, and other unidentified wood volatiles suspected to be monoterpenes. The GM of the 220 inhalable particulate samples was 1.0 mg/m3 whereas the mean abietic acid, pimaric acid, and estimated wood dust levels were 7.2 microg/m3, 0.6 microg/m3, and 0.5 mg/m3, respectively. The GMs of the 222 monoterpene samples were 0.1 mg/m3 for alpha-pinene, 0.3 mg/m3 for beta-pinene, 0.1 mg/m3 for delta3-carene, and 0.5 mg/m3 for the unidentified wood volatiles. Monoterpene exposures were much lower than those observed in other studies conducted in Sweden and Finland. The results of this exposure assessment highlight the importance of considering the content of airborne particulates in lumber mills as well as potential exposure to wood chemicals.

The determination of wood-dust levels in school workshops

The determination of wood-dust levels in school workshops

Level and distribution of employee exposures to total and respirable wood dust in two Canadian sawmills.

Personal respirable (N = 230) and total (N = 237) dust measurements were made in two coastal British Columbia sawmills using a sampling strategy that randomly selected workers from all jobs in the mills over two seasons. Information about job title, department, season, weather conditions, location of the job relative to wood-cutting machines, and control measures also was collected at the time of sampling. Only 16 respirable wood dust samples were above the detection limit of 0.08 mg/m3; all 16 had levels < or = 0.20 mg/m3. Total wood dust concentrations were also low (36% less than the detection limit), with a mean of 0.51 mg/m3, and ranging from < 0.08 to 52 mg/m3. Measurements of exposure taken close to chippers, planers, and multiple saws had the highest total wood dust levels. Sawmill department and booth enclosures also were associated with wood dust concentrations, while local exhaust ventilation and weather conditions were not. Wood dust levels in this study were generally lower than in other studies of this industry, but most sawmill investigations report mean wood dust concentrations lower than those measured in the furniture and cabinetmaking industries, where concerns about wood dust exposures initially were raised.

Sinonasal cancer and occupational exposure to formaldehyde and other substances.

A case-control study of cancer of the nose and paranasal sinuses was conducted in France to determine whether occupational exposure to formaldehyde was associated with an increased risk of sinonasal cancer. Exposures to 14 other substances or groups of substances were also studied (wood dust, leather dust, textile dust, flour dust, sugar dust, coal/coke dust, nickel compounds, chromium compounds, chromium VI, welding fumes, soldering fumes, cutting oils, paints and lacquers, glues and adhesives). Cases (n = 207) and controls (n = 409) were interviewed to obtain detailed information on job history and other potential risk factors for sinonasal cancer. In addition, a questionnaire specially designed for this study was used to help assess exposures to formaldehyde and other substances of interest. The questionnaires were translated into history of occupational exposure by an expert in industrial hygiene, without knowledge of case-control status. Several exposure variables (lifetime average level, duration, cumulative level) were used to describe the risk related to exposure to formaldehyde. Potential confounding factors (occupational and non-occupational) were examined and adjusted for when necessary. No significant association was found between exposure to formaldehyde and squamous-cell carcinomas of the sinonasal cavities. Because of the strong association between exposure to wood dust and nasal adenocarcinoma, it was not possible to assess an independent effect of formaldehyde on this type of cancer. However, among males exposed to medium or high levels of wood dust, the risk of adenocarcinoma associated with formaldehyde was significantly elevated for the highest exposure categories for average level (OR = 5.3, 95% confidence interval = 1.3-22.2), cumulative level (OR = 6.9, 95% CI = 1.7-28.2) and duration of exposure (OR = 6.9, 95% CI = 1.7-27.8). Although a residual confounding effect of wood dust could not be excluded, this study suggests that exposure to both formaldehyde and wood dust may increase the risk of nasal adenocarcinoma, by comparison with the risk due to wood dust alone. This study also indicated an increased risk among males who had been exposed to glues and adhesives, for all histologic types, which was not explained by a confounding effect of paints and lacquers, wood dust or formaldehyde. No other significant association was observed.