The Risks and Regulations of Hazardous Substances

Samuel Perkins • 5 July 2022

Hazardous substances are dangerous, and knowing how to deal with them is vital to keeping safe

Hazardous substances are any substance than can become a risk and/or cause harm to the person. Substances that come into this category include chemicals, products containing chemicals, fumes, dusts, vapours, mists, nanotechnology, gases and asphyxiating gases and biological agents, etc. Realising what substances can cause harm and how to avoid them is key in keeping safety within the occupation. Three key questions that may need to be considered when planning how you deal with hazardous substances are what you are doing that involves a hazardous substance, how the substance can cause harm and how you can prevent the substance from causing harm. Firstly, it needs to be understood how someone can be exposed to a hazardous substance. This can be done through various ways such as by breathing fume, dust, gas or mist, by skin contact. by injection into the skin. by swallowing. As made apparent it is very easy for someone to be exposed to a substance that could cause a health risk. In reducing the risks most exposure can be eliminated from the source or through substitution such as finding a safer process or milder solution.


For times where it is difficult to eliminate or substitute the usage/exposure of hazardous substances, there is a limit amongst how much exposure is allowed within the workplace otherwise known as the Workplace Exposure Limit. The WEL is provided by COSHH (Control of Substances Hazardous to Health Regulations 2002). Worksheets are distributed to help occupations measure and control what workers are exposed to during a specific task so that the risk of major health issues due to exposure is reduced to as low a level as possible. Within the WEL guide, it details long-term and short-term exposure limits with every substance that proposes health risks from exposure. The limits are often revised and may be subject to change over time if evidence suggests that exposure limits can change. Exposure is measured in two ways parts per million (PPM) and milligram per cubic meter (MG/M3).  Not every substance is covered by every metric. Using substances over the recommended limits could result in health issues amongst workers and could lead to legal trouble or other consequences if limits are exceeded. No work place wants to be known as being unsafe and keeping exposure to a low can help maintain a safe working environment.


Now the limit of the exposure is known for the task at hand, next is to know what to do during times of exposure. Like with the substances, depending on the task and field of occupation being considered, the requirements vary for what needs to be done whilst during times of exposure. Of course, different occupations are going to be more likely to be exposed to differing substances than others. Take engineering as an example, engineers will be exposed to various dusts, gases, fumes and so on that could present a health risk to them. The controls in place during times of exposure for engineers include dust, fume or vapour extraction; respirators; Fluid maintenance; skin checks. Maintaining these controls to the highest of quality will ensure exposure can be kept to a low and can’t cause any real damage or health issues to workers. The more protection the better. In most cases people don’t know the damage being caused by hazardous substance exposure so it’s critical for controls to be in place and for occupations to realise if the substances they are using can be deemed as being hazardous.


It’s important to acknowledge that substances such as lead, asbestos or radioactive substances also harmful have further requirements when dealt with than the previous substances mentioned. The reason for the further requirements is due to the greater risk they cause of exposure and severity of health risks that they have been evident to have made. Most occupations may use substances that could seem low risk. If this is the case, it's still vital to check every substance used to make sure they don't have any further requirements or have a limit of usage. This should all be done during the plan stage when managing safety.


by Shaquon Ogarro 24 February 2026
Every workplace, no matter how small or low-risk, contains hazards that can lead to injury, ill health, or costly disruption if they aren’t properly managed. Carrying out a risk assessment isn’t just a legal requirement for many UK businesses; it’s one of the most practical tools you have to protect your people, maintain productivity, and demonstrate responsible management.  Step 1: Identify the Hazards Begin by walking around your workplace and observing tasks, equipment, and materials. Ask yourself: What could go wrong here? What could cause injury, illness, or property damage? Common examples include: Slips, trips, and falls Manual handling Fire risks Noise and vibration Chemical exposure Electrical hazards Don’t forget less obvious risks like stress, fatigue, or poor ergonomics, regulators are increasingly recognising these as significant. Tip: Involve employees. They often spot day-to-day hazards that managers might overlook. Step 2: Decide Who Might Be Harmed and How First, consider everyone who could be impacted, not just employees. Direct staff (operators, office workers) Contractors and visitors Members of the public (for customer facing businesses) Next, record who faces each hazard and explain how it could harm them, for example, cleaning staff handling disinfectants. Tip: Consider vulnerable groups such as young workers, new starters, or pregnant employees. Step 3: Evaluate the Risks and Decide on Precautions This is where you decide what you’ll do about the risks . For each hazard, ask: How likely is harm to occur? How severe could the outcome be? Use a risk matrix (e.g., 1–5 for likelihood × 1–5 for severity) to prioritise actions. Then apply the Hierarchy of Safety Measures : Eliminate the hazard altogether. Substitute for something less hazardous. Apply engineering controls (e.g., barriers, ventilation). Introduce administrative controls (e.g., safe systems of work). Provide personal protective equipment (PPE) as a last resort. Example: Instead of providing ear defenders for noisy machinery, consider replacing the equipment or adding soundproofing where possible. This provides a higher level of control. Step 4: Record Your Findings and Implement Controls If you have five or more employees , you are required to maintain written records of your risk assessments. But even smaller businesses should record key findings; it’s a good practice and a strong defence if inspected. Your record should include: The identified hazards Who might be harmed and how The control measures in place or needed Who is responsible for implementing them Target completion dates Once completed, communicate the results clearly to employees and ensure that actions are followed up on. Risk assessments are only practical if they lead to real change. Step 5: Review and Update Regularly Workplaces evolve, and the introduction of new equipment, materials, and processes brings about new hazards. You should review your risk assessments: At least annually After significant changes in work activity Following an accident or near-miss When new legislation or guidance is introduced Document reviews and updates demonstrate proactive management, ensuring your compliance evidence remains up to date. Common Mistakes to Avoid Copying someone else’s template without tailoring it to your site Overcomplicating small risks Focusing only on paperwork, not action Failing to involve employees Not revisiting assessments after changes A “suitable and sufficient” risk assessment should be specific, proportionate, and regularly reviewed .
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