| Classification | Agent | Exposure |
| Allergic/immunologic | ||
| Natural | Guar gum | Carpet worker |
| Latex | Nurse | |
| Psyllium | Nursing home | |
| Rats | Laboratory researcher | |
| Synthetic | Acid anhydride | Epoxy worker |
| Platinum | Jeweler | |
| Toluene diisocyanate | Spray painter | |
| Non-allergic | ||
| Irritant-induced | Air pollutants | Outdoor, inner city worker |
| Cigarette smoke | Any workplace | |
| Cold air | Meat packer | |
| Hairspray | Department store | |
| Talc | Cosmetics industry | |
| Corrosive | Ammonia | Chemical plant |
| Annoyance | Detergents | Supermarket |
| Perfumes | Department store | |
