15. A pulmonary health certificate ceases to be valid,(1) where, subject to the second paragraph of section 4, more than 3 years have elapsed since the last pulmonary health examination or, where applicable, more than 6 years have elapsed since the pre-employment medical examination of a worker who has never in the past been exposed to asbestos or silica; or
(2) where a final decision rendered pursuant to the Act respecting industrial accidents and occupational diseases (chapter A-3.001) states that the worker has a pulmonary occupational disease that results form exposure to asbestos or silica.