Saw or sand arsenic-treated wood
Saw or sand wood treated with coal tar creosote
Smelt or cast lead
Smelt or refine zinc or copper
Spray and resand chromate-containing paints
Spray chlorothalonil or tetramethrin (pesticides)
Spray epoxy or polyurethane paint, shellac, lacquer, or varnish
Spray paints or glazes containing cadmium pigments
Spray polyurethane foam insulation
Sterilize equipment with ethylene oxide
Swim in contaminated water (ingestion or inhalation)