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Wood dust is classified as a known human carcinogen on the basis of studies linking exposure and cancers of the nasal cavity and sinuses. Support for an association with other, more common, cancers is not as strong, but a new study by Jayaprakash et al.1 may provide useful new evidence. The authors’ large, hospital-based case-control study of cancers of the oral and nasal cavities, pharynx, larynx, trachea, lung and oesophagus among men found about a 30% increase in the risk of this combined group of aerodigestive and respiratory cancers among participants reporting exposure to wood dust. A larger excess risk of 69% was found for lung cancer, and the risk appeared to increase with the level of exposure. Indications of excess risk were also found for cancers of the nasal cavity and larynx, but for oesophageal cancer.
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Analyses of the air in underground railways in several large cities show that
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