Compare ISO 14001 and OHSAS 18001: ISO 14001 is an Environmental Management System (EMS) which provides a structure for measuring and improving an organization’s environmental impact. OHSAS 18001 is an Occupational Health and Safety Management System (OHSMS) which provides a system for measuring and improving an organization’s health and safety impact. The main difference between ISO 14001 and OHSAS 18001 is that: ISO 14001 focuses on managing your organization’s impact on the external environment, to reduce pollution and comply with regulations. OHSAS 18001 focuses on managing your organization’s internal environment to ensure a safe and healthy workplace. Get a quote & full details about i:+91-9310826642