a. employees who are or may be exposed to carcinogenic or mutagenic chemicals classified as Carc. 1A, Carc. 1B, Muta. 1A or Muta. 1B under the Regulations of 16 June 2012 No 622 on the classification, labelling and packaging of substances and mixtures (CLP). b. employees who are or may be exposed to substances, mixtures or processes on the following list: - work involving the production of auramine, - work involving exposure to polycyclic aromatic hydrocarbons (PAH) which occur in soot, tar or pitch, - work involving exposure to dust, fumes or mist emitted during calcination and electrolytic processing of nickel from ore, - work that involves highly acidic processes to produce 2-propanol, - work that entails exposure to hardwood dust, c. employees who work with lead and lead compounds.