Industrial Hygiene

RJ Lee Group identifies, evaluates, analyzes, and suggests control measures for environmental elements that originate in the workplace and may cause potential source of risk to workers or the environment. We offer analytical and consultative industrial hygiene services in materials research and selection, environmental health and safety and quality control throughout the product life cycle.

Particulate Matter (PM)

Identifying particulate’s composition can lead to the source of particulate or contamination. When air quality concerns exist, identifying particulate size will reveal if it exceeds the criteria for respirable particulate matter (RPM). RJ Lee Group’s team of experts is familiar with industry standards and guidelines that ensure environmental safety and health, and we can assess potential negative impacts to determine where controls are necessary. This is especially important in industries that manufacture pharmaceuticals and electronic materials that may generate contaminants of concern down to the nano level. We observe manufacturing processes to uncover environmental or occupational issues and recommend changes to reduce potential exposure and contamination. Our expertise ranges from the regulatory demands of hospital pharmacy and clean room environments, to the characterization of aggregates and nuisance dust in the construction industry, to the monitoring of air in coal mines and examination of flyash from coal-burning plants.

Unbound Nanoparticles (UNP)

Unbound Nanoparticles can be man-made, or can occur incidentally in ambient air in the form of diesel and welding fumes and coal combustion. Natural sources, such as smog or fire, can also be cause for concern. Materials at the nanoscale level exhibit different properties than they do at the macro level. At the nano scale, their molecules tend to self-assemble and form new structures. We use electron microscopy, diffraction and spectroscopy techniques to measure size, determine morphology and agglomeration state, elemental composition and the structures of new materials at the nanoscale. RJ Lee Group is a leading edge contributor to nanoscale particulate studies and has successfully completed several monitoring projects for federal government and industry clients where the health and safety hazards as well as environmental impacts related to UNP were evaluated. We work in collaboration with industry, government and academia to characterize nanoparticles and to prepare for their regulation.

Monitoring and Sampling

RJ Lee Group has extensive practical experience in designing and implementing air sampling and monitoring plans to measure particulate matter, asbestos, dust, vapors, metals and crystalline silica, PCBs, PNAs and dioxins. We also perform environmental site assessments and source apportionment plans to determine the contributions of various pollution sources to a location of interest. We can help determine the best approach for monitoring particulate matter or vapors and aerosol particles including:

  • Indoor Air Quality (IAQ) and Workplace Monitoring (IEQ)
  • To meet EPA requirements
  • Assess personal exposure of workers to volatile compounds
  • To determine process pollutants
  • Environmental Monitoring
  • Source identification
  • Source apportionment
  • Nuisance dust monitoring
  • Simulation chambers
  • Product Labeling Information
  • Provide a controlled environment to establish product safety information such as generation rate and exposure impact for MSDS and information/warning labeling.



RJ Lee Group has offered a wide range of Industrial Hygiene Services for over 30 years. Our experts work with the manufacturing, mining, oil and gas, education, transportation, metals, environmental, and plastics industries, among many others.