Work environment measurement (WEM) is the planned measurement of physical and chemical conditions in a workplace, such as airborne dust, fumes, gases, noise, heat and lighting, to find out how much workers are exposed to and whether it stays within accepted limits. It is part of occupational health and safety, and the term is used particularly in countries such as Japan, where measurement of certain workplaces is set out in law; elsewhere the same work is often called workplace exposure monitoring or industrial hygiene monitoring.
Not to be confused with Wireless Expense Management (tracking and controlling mobile lines, devices and carrier costs) or Workforce Engagement Management (contact center tools for scheduling, quality and agent engagement), which are also abbreviated WEM.
At a glance
- WEM measures workplace hazards, such as airborne contaminants, noise, heat, vibration and lighting, and compares results with exposure limits.
- Requirements vary by country and industry; in some jurisdictions measurement of certain workplaces is mandatory and must be done by qualified people.
- Traditional measurement uses sampling equipment and trained specialists; continuous sensors add trend data between formal surveys.
- Results drive corrective action (ventilation, enclosures, process changes, protective equipment) and form part of safety records.
- For IT and facilities buyers, the technology question is usually how sensor data is collected, networked, stored and reported.
What problem it solves
Many workplace hazards are invisible or gradual. Dust and solvent vapors can build up without being noticed, and hearing damage from noise develops over years. Without measurement, an employer cannot tell whether workers are exposed above safe limits or whether controls such as ventilation are actually working.
WEM turns these conditions into numbers. It shows where exposure is high, which jobs or shifts are affected and whether improvements made a difference. It also produces the records that safety regulators, insurers, auditors and employees may ask for.
How it works
Plan. A safety professional identifies likely hazards by process, area and job, then decides what to measure, where, when and how often, using the methods that apply to the workplace’s standards.
Measure. Specialists use instruments matched to each hazard: air sampling pumps and filters or sorbent tubes for dust and chemicals, sound level meters and noise dosimeters for noise, heat stress meters and light meters. Some sampling is done in fixed locations; personal sampling uses devices worn by workers during a shift. Laboratory analysis may follow.
Evaluate. Results are compared with the exposure limits that apply, which differ between countries and regulators. Many programs also compare against stricter internal targets.
Act and record. Where results are high, the employer adds controls, such as local exhaust ventilation, enclosures, substitution of materials, work rotation or protective equipment, and measures again. Results and actions are documented for the period the applicable rules require.
Continuous monitoring. Fixed or wearable sensors, often connected through Internet of Things (IoT) networks, can track conditions such as particulates, gases, noise, temperature and humidity continuously and alert when thresholds are crossed. They fill gaps between formal surveys but do not always meet the method requirements for compliance measurements.
When it matters for buyers
- When you run manufacturing, warehousing, labs, healthcare or construction sites. These environments are where airborne and noise hazards are common.
- When you deploy sensor networks. Continuous air quality, noise or temperature monitoring needs reliable connectivity, device management and a place to store and report the data. Our Internet of Things overview covers the connectivity and platform side.
- When you add sensors to offices. Indoor air quality and temperature sensors are often part of smart building projects and may share infrastructure with a building management system.
- When records are requested. Regulators, insurers or customers may ask for exposure data and evidence of corrective action.
Questions to ask vendors
- Which hazards can your sensors measure, and how do their accuracy and methods compare with those required for compliance measurement where we operate?
- How are sensors calibrated, and who maintains calibration records?
- What connectivity do the sensors use (Wi-Fi, cellular, LoRaWAN or other low-power networks), and what happens to data when the connection drops?
- Where is the data stored, for how long, and can we export it in a format our safety team and consultants can use?
- How are alerts configured, and who receives them?
- Can your platform integrate with our building management or environmental, health and safety systems?
How it differs from building management and occupancy monitoring
A building management system (BMS) controls heating, ventilation, lighting and other building systems, and it often measures temperature, humidity and sometimes CO2 to run them. Occupancy monitoring measures how many people use a space. Work environment measurement is different in purpose: it assesses worker exposure to hazards against health limits, using methods that safety rules recognize. Sensor data from a BMS or smart building platform can support a WEM program, but it is usually not a substitute for formal exposure measurement. For a broader view of evaluating hazards, see risk assessments.
Problems this helps with
- Need to show we measured noise, dust or chemical exposure at our sites
- Spot checks miss conditions that change by shift or season
- Want continuous air quality or noise data across several buildings
