Generate grain dust
Inhale aspergillus in bakery, beet sugar refinery, or biotechnology plant
Inhale petroleum vapors containing benzene
Mix or pack pharmaceutical products
Prepare, card, or spin natural vegetable fibers (a heavy exposure)
Produce nacre buttons from mollusc shells
Repeatedly inhale bioaerosols of slime mold
Repeatedly prepare, card, or spin natural vegetable fibers
Use hydroxylamine for de-inking in paper recycling