How can one be able to know that his/her organisation is complying with the OHSAS 18001 health and safety management system?

To Start with, Do a gap analysis

BY DEVELOPING THE LEGAL COMPLIANCE REGISTER WITH APPLICABLE LAWS ARE LISTED AND EVALUATED FROM TIME TO TIME.

ALSO BY VERIFYING THE NOTICES OR WARNING ISSUED BY THE LOCAL / COMPLIANCE BODIES

There have been many examples of organizations that have reached and maintained their legal compliance as a result of implementing and maintaining an OH&SMS that conforms to the standard – while certification of an OH&SMS against the requirements of OHSAS 18001 is not a guarantee of legal compliance, it is a proven and efficient tool to achieve and maintain such legal compliance. Applying this systematic approach to the requirement of compliance with legal and other requirements will prevent your organization from unintentional violation of legislation, and possibly prevent ill health and injuries in the work place....best