What is an Certified Industrial Hygienist (CIH)?

An industrial hygienist, as defined in Wikipedia, is a professional who is dedicated to the anticipation, recognition, evaluation, communication and control of environmental stressors in, or arising from, that may result in injury, illness, impairment, or affect the well being of workers and members of the community. The stressors that an industrial hygienist evaluate are biological, chemical, physical and ergonomic. In a nutshell: an industrial hygienist uses expertise in the areas of biological, chemical, physical and ergonomic to help you keep your employees safe and healthy. A certified industrial hygienist is a key player in a saavy organization that values its employees and reinforces proactive health and safety measures as a matter of good business.

The American Board of Industrial Hygienists (ABIH) certifies an industrial hygienist as a CIH when they demonstrate a working knowledge of the Industrial Hygiene body of knowledge through both education, experience and have successfully passed the CIH exam.

Mark Close is a CIH and has the following education and experience:

  • Master of Science in Industrial Hygiene
  • Certified Industrial Hygienist (CIH)
  • AHERA Asbestos Building Inspector
  • 25 years helping clients achieve OSHA and WISHA compliance. Mark has experience working with most industries in the Puget Sound area.


What should you expect from a CIH?

A good CIH brings much to the table. A certified industrial hygienist utilizes a strict methodology and brings extensive experience and expertise to determine potential hazards, exposures or risks in the workplace and environmental studies. A certified industrial hygienist can review and/or design and develop health and safety programs based upon the scope of work, site walk through and hazard evaluations. A certified industrial hygienist is able to help with everything from asbestos to ventilation.

Mark Close has over 25 years experience helping clients throughout the Puget Sound area and the Pacific Northwest bring their written health and safety programs and work place practices into compliance with OSHA/WISHA standards. Mark has a freakishly comprehensive knowledge of the Washington Administrative Codes (WAC) as well as an ability to translate this knowledge into practical working solutions. Mark Close's expertise goes well beyond the traditional CIH realm..

Most certified industrial hygienists have unique specialties. Mark Close's unique area of specialty is fire service and the hazards associated with the emergency responder community.

When should you bring a Certified Industrial Hygienist onto a project?

Before the project, during the project and after the project. A CIH provides a nationally recognized level of competency to your project. Many contracts require that there is a Certified Industrial Hygienist of record. Whether a CIH is required by the contract specifications or you decide to bring a CIH in on an in-house issue, you can rest assured that you are receiving the assistance from a "ABIH Board Certified" Health & Safety Professional.

Read on to find out more about Mark Close and the type of Certified Industrial Hygiene services he offers.

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Mark Close, CIH, MS

Certified Industrial Hygienist

25+ years experience helping clients with their health and safety needs.


Mark Close of the Close Group serves clients as a Health and Safety consultant in the Seattle-Puget Sound Area. As a certified industrial hygienist (CIH) and he brings over 25 years of industrial hygiene and safety compliance expertise to our clients.

A strong health and safety program is fundamental to an organization and a lack of one can cause a decrease in worker productivity, high turnover, increased workers compensation claims. Let the Close Group help you build a health and safety program that works for your organization.

Education Training and Experience

  • Master of Science in Industrial Hygiene
  • Certified Industrial Hygienist (CIH)
  • AHERA Asbestos Building Inspector
  • 25+ years experience helping clients achieve OSHA/WISHA compliance

The Close Group Approach
We believe we can best serve our customers by approaching each project as a collaborative venture and partnership to achieve desired results.

Our Health and Safety services include:

  • Accident Investigation
  • Airborne Contaminant Assessment
  • Asbestos Management
  • Confined Space/Rescue Training
  • Expert Witness
  • Emergency Response/ Hazardous Waste Audit, Development and Training
  • Health & Safety Program Development
  • Hearing Conservation/Noise Surveys
  • Job Hazard Analysis
  • Lead Fixed Industry and Construction Compliance
  • Jobsite Health & Safety Audits
  • Respiratory Protection Program Compliance Audit
  • Underground Construction Field Audit and Program Review
  • Customized Training Development and Delivery
Client References
  • Birmingham Steel
  • American Presidents Line
  • Jensen Boat
  • Delta Marine
  • Genie Industries
  • Tri State Construction
  • Scarsella Brothers Construction
  • Wilder Construction
  • University Mechanical Contractors
  • Sequoyah Electrical Contractor
  • Viox Corporation
  • CH2M Hill
  • Howard S. Wright Construction
  • McNally Tunneling
  • Northwest Boring
  • Nuprecon
  • Seattle Boiler Works
  • Johnson Controls
  • Lafarge North America Inc.
  • Bellingham, Maple Valley, Seattle, WSU Fire Departments
  • Washington State Fire Training Academy
  • Edmonds Police Department
  • University of Washington
  • Port of Seattle
  • Highline Hospital

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