Section 4:

4. Protective clothing to be worn (1) Subject to subsection (2), no worker shall enter, or be present, and no person shall cause or permit a worker to enter or to be present, in a building in which a dangerous chemical is being used or has been used unless the worker wears— (a) an overall, a hood, gloves and a respirator where the specified chemical substance is used by means of an aerosol dispenser or a smoke generator; (b) an overall, a hood, gloves, boots and a respirator or any other suitable and appropriate protective equipment as indicated in the label and Safety Data Sheet where no aerosol dispenser or smoke generator is used and the substance is a dangerous chemical specified in the Second Schedule; (c) an overall, a hood, gloves, boots and a face shield or any other suitable and appropriate protective equipment as indicated on the label and safety data sheet, in all other cases where a dangerous chemical specified in the First Schedule is used. (2) No protective clothing shall be required to be worn where the doors and windows representing at least 10% of a floor area of the building have been opened during the seventh hour after the use of the specified substance.