What Is an Industrial Hygienist? Duties, Path and Pay

OSHA describes industrial hygiene as the science and art devoted to the anticipation, recognition, evaluation and control of workplace conditions that can cause illness or injury. Those four words are a good map of the job.

Anticipation means spotting a health hazard before it reaches workers, for example when a new process, chemical or piece of equipment is being planned. Recognition means walking the floor and identifying exposures that already exist. Evaluation means measuring them: OSHA notes that industrial hygienists use environmental monitoring and analytical methods to find out how much workers are actually exposed to. Control means choosing and verifying the fix.

OSHA describes a worksite analysis as the essential first step: understanding the tasks, the materials and the people involved before deciding what to sample. In practice that means reading safety data sheets, talking with operators and supervisors, and watching how a job is really done rather than how the procedure says it is done.

OSHA groups the hazards industrial hygienists work with into a few families. Air contaminants include dusts, fumes, mists, fibers, gases and vapors. Chemical hazards can enter the body by breathing, skin contact or ingestion. Biological hazards include bacteria, viruses and fungi. Physical hazards cover noise, vibration, radiation, lighting and temperature extremes. Ergonomic hazards come from job design, repetitive motion, heavy lifting and poorly designed tools or work areas.

Controls follow a clear order of preference. OSHA describes engineering controls first, because they remove or reduce the hazard at the source or isolate people from it. Work practice and administrative controls come next: better procedures, housekeeping, supervision, or scheduling the dirtiest tasks when the fewest people are present. Personal protective equipment is used when other controls are not feasible or while they are being installed, and it only works when it is properly selected, fitted, worn and maintained.

Much of the real skill is in that order. A respirator program is often faster to roll out than a ventilation project, and a good industrial hygienist can explain to a plant manager why the faster option is not the end of the story.

O*NET groups industrial hygienists under Occupational Health and Safety Specialists (19-5011.00). Its sample job titles for that occupation include Industrial Hygienist, Industrial Hygiene Consultant, Chemical Hygiene Officer and Risk Control Consultant, which shows the range of settings. Typical tasks it lists include developing noise surveys, atmosphere monitoring, ventilation surveys and asbestos management plans, and collecting samples of dust, gases and vapors for analysis.

OSHA itself relies on industrial hygienists to evaluate jobs for health hazards, help develop standards and work as compliance officers. Beyond government, you will find industrial hygienists in manufacturing, chemicals, pharmaceuticals, energy, construction, health care and in consulting firms that serve many clients. Insurance carriers also hire them for risk control roles.

When you read a posting, look at how the work is split. In-house roles at one large site tend to mean long-term programs and close relationships with operations. Consulting and multi-site roles usually mean more travel, more variety and more reporting. Some EHS generalist roles include industrial hygiene as one duty among many, so check how much sampling and program ownership the job really includes.

Most industrial hygienists start with a science or engineering degree. In O*NET's education data for the broader specialist occupation, 74 percent of respondents said a bachelor's degree is required, with smaller shares reporting a post-baccalaureate certificate or a master's degree. BLS notes that relevant coursework includes topics such as ergonomics, safety management and industrial hygiene alongside science.

Dedicated industrial hygiene degrees exist at the bachelor's and master's level, and some are accredited by ABET. ABET publishes a searchable list of accredited programs, and AIHA's academic accreditation committee helps define the topics those programs must cover. An accredited degree is not required to enter the field, but it can count toward the experience needed for the CIH, as described below.

People also arrive from chemistry labs, environmental work, safety generalist roles and the military. The common thread is hands-on sampling experience. If you are early in your career, ask for chances to run noise dosimetry, air sampling and ventilation checks under a senior hygienist, and keep a record of what you did: you will need it later to document your experience.

The Certified Industrial Hygienist (CIH) is the best-known professional credential in the field. It is issued by the Board for Global EHS Credentialing (BGC), which was founded in 1960 as the American Board of Industrial Hygiene and announced its current name in 2019.

As of this writing, BGC's published requirements include a qualifying bachelor's degree (for example biology, chemistry, physics or engineering, an ABET-accredited industrial hygiene or safety program, or another degree with enough science credit), 180 academic or 240 continuing education contact hours of industrial hygiene coursework, ethics training, and 48 months of professional-level industrial hygiene experience. That experience must be broad, covering at least two of four stressor categories: chemical, physical, biological and ergonomic. An accredited industrial hygiene degree can count for up to one year of that experience.

Applicants also submit professional references, with at least one from a current CIH where possible. The exam has 180 multiple-choice questions, 150 of them scored, split into two sections of two and a half hours each. Its subject areas range from air sampling, toxicology and ventilation to noise, radiation, ergonomics and program management.

BGC runs spring and fall testing windows. As of this writing it lists a $160 application fee and a $370 exam scheduling fee, and certified holders pay an annual maintenance fee and complete certification maintenance to keep the credential. Check BGC's site for current deadlines and fees before you apply.

BLS does not publish a separate pay figure for industrial hygienists. They fall within the broader occupational health and safety specialist group, so its numbers describe the whole occupation rather than industrial hygiene alone.

With that caveat, BLS reports a median annual wage of $90,150 for occupational health and safety specialists in May 2025. It projects employment of specialists to grow 18 percent from 2025 to 2035, which it describes as much faster than average for all occupations. BLS also notes that the work often involves travel and fieldwork and that protective equipment such as respirators and gloves is part of the job.

Within the occupation, pay varies with industry, location, scope and credentials. When you compare offers, look past the title: who owns the sampling budget, how many sites you cover, and whether the role leads programs or only supports them.

The work suits people who like science applied to real problems. You need to be comfortable with calculations, instruments and data quality, and just as comfortable standing on a production floor asking an operator to wear a sampling pump for a full shift. Clear writing matters, because your sampling report is often what decides whether a company spends money on controls.

Hiring managers usually check three things: whether you have actually planned and run exposure assessments rather than just observed them, whether you can explain results in plain language, and whether you are on a credible path to the CIH. If you are coming from general safety, adding documented sampling experience is often the fastest way to make the case.