| Occupation at risk | |
| Low molecular weight chemicals | |
| Isocyanates (eg, toluene diisocyanate, diphenylmethane diisocyanate, hexamethylene diisocyanate, naphthalene diisocyanate) | Polyurethane workers, roofers, insulators, painters |
| Anhydrides (eg, trimellitic anhydride, phthalic anhydride) | Manufacturers of paint, plastics, epoxy resins |
| Metals (eg, chromic acid, potassium dichromate, nickel sulfate, vanadium, platinum salts) | Platers, welders, metal and chemical workers |
| Drugs (eg, beta-lactam agents, opiates, other) | Pharmaceutical workers, farm workers, health professionals |
| Wood dust (eg, Western red cedar, maple, oak, exotic woods) | Carpenters, woodworkers |
| Dyes and bleaches (eg, anthraquinone, carmine, henna extract, persulfate, reactive dyes) | Fabric and fur dyers, hairdressers |
| Amines (eg, chloramine, quaternary amines) | Chemists, cleaners, plastic manufacturers |
| Glues and resins (eg, acrylates, epoxy) | Plastic manufacturers |
| Miscellaneous (eg, formaldehyde, glutaraldehyde, ethylene oxide, pyrethrin, polyvinyl chloride vapor) | Laboratory workers, textile workers, paint sprayers, health professionals |
| High molecular weight organic materials | |
| Animal proteins (eg, domestic and laboratory animals, fish and seafood) | Farmers, veterinarians, poultry processors, fish and seafood processors |
| Flours and cereals | Bakers, food processors, dock workers |
| Enzymes (eg, pancreatic extracts, papain, trypsin, Bacillus subtilis, bromelain, pectinase, amylase, lipase) | Bakers, food processors, pharmaceutical workers, plastic workers, detergent manufacturers |
| Plant proteins (eg, wheat, grain dust, coffee beans, tobacco dust, cotton, tea, latex, psyllium, various flours) | Bakers, farmers, food and plant processors, health professionals, textile workers |
