Before 1975, mixed, sprayed, or sanded asbestos-containing materials
Grind or cut tiles, stones, concrete, bricks, or terrazzo
Roofing or paving with exposure to coal tar pitch volatiles
Use hand-held saw or grinder to remove brick mortar
Work as cement floorer with exposure to chromate salts
Work in tunnel construction for years with heavy exposure to NO2 (blasting & diesel exhaust)