Raise dust from bird roosts, chicken coops, or bat-inhabited caves endemic area
Raise dust of excreta from rodents
Raise farm dust contaminated with Francisella tularensis bacteria
Reclaim scrap metal containing lead, cadmium, beryllium, or mercury
Refine platinum
Remove cadmium coatings
Remove chromate-containing paints by abrasive blasting
Remove insulation installed before 1975
Remove lead coatings
Remove or replace PCB contaminated fluid in transformers
Repair or maintain gasoline or jet fuel tanks
Repeatedly debark maple trees to obtain sap
Repeatedly inhale bioaerosols containing mold (asthmogenic)
Repeatedly inhale bioaerosols of bird droppings
Repeatedly inhale bioaerosols of cheese containing Penicillum species
Repeatedly inhale bioaerosols of moldy barley
Repeatedly inhale bioaerosols of moldy sugarcane bagasse
Repeatedly inhale bioaerosols of moldy wood pulp
Repeatedly inhale bioaerosols of slime mold
Repeatedly inhale bioaerosols of soy sauce fermentation starter
Repeatedly inhale dust harvesting peat moss
Repeatedly inhale dust of esparto grass
Repeatedly inhale dust of moldy greenhouse soil
Repeatedly inhale dust of moldy tobacco
Repeatedly inhale moldy cork dust
Repeatedly prepare, card, or spin natural vegetable fibers
Roofing or paving with exposure to coal tar pitch volatiles