(3) Biological agents (bacteria and other micro-organisms), if they are directly connected with the work, such as with farming, sewage treatment, or healthcare, or if the exposure is incidental to the work (e.g. exposure to bacteria from an air-conditioning system that is not properly maintained).
(4) Any kind of dust if its average concentration in the air exceeds the levels specified in COSHH.
(5) Any other substance which creates a risk to health, but which for technical reasons may not be specifically covered by CHIP including: asphyxiates (gases such as argon and helium, which, while not dangerous in themselves, can endanger life by reducing the amount of oxygen available to breathe), pesticides, medicines, cosmetics or substances produced in chemical processes.