15 Air monitoring
1 Every employer shall take adequate steps to monitor the exposure of his employees to asbestos where such monitoring is appropriate for the protection of the health of those employees.
2 The employer shall keep a suitable record of any monitoring carried out in accordance with paragraph (1) and that record or a suitable summary thereof shall be kept—
(a) in a case where exposure is such that a health record is required to be kept under regulation 16, for at least 30 years;
(b) in any other case, for at least five years.