| Environmental source | Major causative antigen |
| Grain measurer's lung | Cereal grain (Sporobolomyces) |
| Grain dust (mixture of dust, silica, fungi, insects, and mites) | |
| Miller's lung (dust-contaminated grain) | Sitophilus granarius (ie, wheat weevil) |
| Malt worker's disease (moldy barley) | Aspergillus fumigatus, Aspergillus clavatus |
