For the application of 3° of Article R. 4412-12, the employer shall regularly measure the exposure of workers to hazardous chemical agents present in the workplace atmosphere.
When occupational exposure limit values have been established for a hazardous chemical agent in application of Articles R. 4412-149 or R. 4412-150, the employer shall have technical inspections carried out by a body accredited under the conditions laid down in Articles R. 4724-8 to R. 4724-13.
These technical inspections are carried out at least once a year and whenever there is any change likely to have an adverse effect on workers’ exposure. They give rise to a report, communicated in accordance with the provisions of article R. 4412-30.