Occupational Hygiene Services by Certified Occupational Hygienists Our Certified Occupational Hygienists provide you the data you need for informed decision making regarding your workplace environment. SESA Occupational hygiene team includes a Senior Occupational Hygienist who is certified with the Australian Institute of Occupational Hygienists (AIOH) and Chartered Member of the Safety Institute of Australia (SIA) assisted with an experienced team of Occupational Hygienists and Occupational Hygiene Technicians. The team has been providing the occupational hygiene services over a number of years to various clients in Sydney, NSW and Canberra, ACT including government, manufacturing, construction, quarries and mining and to the property sector. At SESA, our occupational hygiene services complement the implementation of your health and safety management system and aim at achieving legislative compliance for our valued clients. What Is Occupational Hygiene?