– hazardous chemicals, cf. Chapter 3; – fibrous asbestos dust, cf. Chapter 4; – biological agents, cf. Chapter 6; – noise or mechanical vibrations, cf. Chapter 14; – ionising radiation, cf. Chapter 15; – artificial optical radiation, cf. Chapter 16; – electromagnetic field, cf. Chapter 16 A; – work under water or under increased ambient pressure, cf. Chapter 26; – gas, dust or other harmful conditions in connection with rock work, cf. Chapter 27.