Health Risk Assessment (HRA) Study

The hazard that does not announce itself

Process safety studies deal with events - a release, a fire, an explosion. A health risk assessment deals with the opposite: daily exposure well below any alarm threshold, whose effect appears years later. Nothing goes wrong on any particular day, which is exactly why it is under-managed.

What an HRA covers

• Chemical agents - solvents, dusts, fumes, gases, assessed against occupational exposure limits by inhalation, skin and ingestion route
• Physical agents - noise, vibration, heat stress, illumination
• Ergonomic factors - manual handling, repetitive work, posture
• Biological agents, where the process involves them

How the assessment runs

• Build the inventory of agents and map who is exposed to what, and for how long
• Group workers into similar exposure groups, so monitoring effort is proportionate
• Personal and area monitoring for the agents that matter, against the applicable occupational exposure limit
• Rank the risk and set a control plan following the hierarchy - eliminate, substitute, engineer, administer, and only then PPE
• Define the medical surveillance the findings justify

Why respirators are the wrong first answer

PPE is the least reliable control because it depends on correct selection, fit and consistent use by every worker on every shift. It sits at the bottom of the hierarchy for good reason. An HRA that concludes "issue respirators" for every finding has not done the engineering work.