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Airborne particulate from wood, MDF, foam carving, textiles, welding, and spray painting is a pervasive chronic hazard in performing arts production. This article covers particle size and respiratory deposition, wood dust carcinogenicity, MDF and formaldehyde, polyurethane isocyanate sensitization, welding fume, OSHA PELs, ACGIH TLVs, and respirator selection.