Speed Limit for Air Quality: How Does It Work?

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You may have heard about how some areas of the UK are trialling lower speed limits in a bid to improve air quality.

In September 2021, the Welsh government introduced new 50 mph zones in five locations in south and north-east Wales. National Highways have also revealed their plans for setting new 60 mph speed limits on certain short sections of their network.

But what sort of impact can a speed limit have on air quality?

In this post we’ll explore the link between speed and pollution. We’ll also discuss some ways you can help improve the air quality in your workplace – whether it’s an office, a school, or a hospital.

How Speed Affects Air Quality

The faster a vehicle travels, the more fuel it burns. And the more fuel a vehicle burns, the more emissions it creates. Emissions from a vehicle’s exhaust contain many potentially harmful pollutants. One of the more harmful pollutants found in a vehicle’s exhaust emissions is NO₂ – nitrogen dioxide. Chronic exposure to NO₂ can lead to a range of respiratory conditions.

NO₂ is also terrible for the environment. If it interacts with the water, oxygen and other chemicals in the atmosphere, it can create acid rain, which can cause immense damage to lakes, forests, and other sensitive ecosystems.

Do Lower Speed Limits Reduce Pollution?

In late 2019, National Highways published the results of a survey that demonstrated a link between speed and emissions in light vehicles. This review suggests that even dropping the speed limit from 70 mph to 60 mph could lead to an overall reduction in harmful emissions.

The Welsh government stated that, following their 50 mph speed limit trials, they’d seen a 47% reduction in air pollution in some areas.

A lower speed limit means less speeding, which means less fuel burnt, which means lower emissions. But a lower speed limit can also discourage certain driving habits. Vehicles burn the most fuel when they’re accelerating. With a lower speed limit, drivers may be less likely to aggressively accelerate to overtake other motorists. This too will have an impact on emissions.

In these trial areas across the UK, the traffic might have slowed down, but it still moves. If all vehicles move at a steady 50 or 60 mph, then it may be less likely that congestion will build up on busy roads. This is why certain “smart motorways” introduce variable speed limits – they can help prevent traffic jams. This can have a positive impact on air quality, as vehicles burn a lot of fuel when they’re idling in traffic.

How to Reduce Pollution and Improve Air Quality In Your Area

Air quality can have a significant impact on public health. This is why workplaces across the country should seek ways to improve the air quality on and around their premises. As we’ve seen, a lower speed limit can positively influence air quality. So if you can, consider introducing a low speed limit on your premises. Not only will this improve air quality, it will also improve safety conditions – particularly if you’re running a school or a hospital.

Unfortunately, it’s likely that you have very little control over the roads surrounding your premises. But you can still make a difference to the air quality inside your workplace.

We offer bespoke air quality monitoring systems for workplaces including hospitals, schools, universities and offices. We can assess the air quality of your premises and advise on a solution to help your staff and service users breathe cleaner, healthier air. We also stock a range of powerful air purifiers suitable for a range of environments, from open plan offices to operating theatres.

Want to talk about how we can help reduce air pollute and improve the air quality in your workplace? Get in touch to talk to one of our air purification experts today

What is the Clean Air Hospital Framework?

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First launched in 2019 by Global Action Plan and Great Ormond Street Hospital, The Clean Air Hospital Framework (CAHF) is a strategy for improving air quality in and around hospitals. The aim is to create a healthier environment for staff, patients, their families, and the local community.

Key Areas of the Clean Air Hospital Framework

The framework focuses on seven key areas to tackle air pollution:

  • Travel
  • Procurement and supply chain
  • Construction
  • Energy
  • Local air quality
  • Communication and training
  • Hospital outreach and leadership

How To Use the Clean Air Hospital Framework

Hospital managers can go through each section of the framework and assess their hospital’s activities against a specific criteria. The end result is a score out of 1,079. Score 50-70% and your rating is “good”. Score over 70% and your rating is “excellent”. Anything below 50% suggests that there’s still a lot of work to be done!

Travel

This section concerns how staff, visitors and patients travel to and around the hospital. It focuses on:

  • Hospital travel planning – providing information and encouraging greener journeys.
  • Walking and cycling infrastructure and facilities.
  • Zero emission vehicle infrastructure.
  • Patient transport and ambulances.
  • Routes to minimise travel.
  • Monitoring and reporting.

Procurement and Supply Chain

This section is all about the choices you make around purchasing, as well as your relationships with suppliers, and the way they deliver their materials.

It focuses on:

  • Procurement and supply chain management.
  • Internal ordering.
  • Items purchased.

Design and Construction

This section considers building layout, material choices, building site traffic, and construction site impacts. It focuses on:

  • Design, including on-site green spaces.
  • Building materials and equipment.
  • Construction and demolition sites.

Energy

How does your hospital generate, procure, and store energy? This section focuses on:

  • Combined Heat and Power (CHP) units and onsite boilers.
  • Electricity procurement and generation.

Local air Quality

This section is all about how your hospital monitors onsite air quality, and the steps you take to improve it. It focuses on:

  • Air quality monitoring.
  • Plant life.
  • Smoking regulations.

Communication and Training

Are you training your staff to think about their role in improving air quality? Do you provide advice to patients? Are you engaging the hospital board, and sharing information across the hospital?

This section focuses on:

  • Clinical advice.
  • Engaging patients.
  • Board level commitment.
  • Communication within the hospital.

Hospital Outreach and Leadership

The final section asks you to consider how your hospital can amplify its impact to reduce air pollution in the local area and beyond. This section focuses on:

  • Community engagement.
  • Influencing for change.

Complete the Clean Air Hospital Framework

You can access the gull CAHF guidance on the Action For Clean Air site. The guidance contains a full breakdown of the scoring system, along with details of the various criteria to focus on when assessing your current activities. There’s also room for outlining your action plan for any areas that need improvement.

Head here to access the Clean Air Hospital Framework Guidance.

Monitoring and Testing Air Quality

To find out more about testing your air quality, read our recent article on how to test indoor air quality in hospitals.

We also offer bespoke air quality monitoring services for hospitals and other healthcare settings. We can monitor your staff’s exposure to any potentially harmful substances. This will help you understand your risk levels, so you can devise an air quality solution that works for you. Find out more about air quality and exposure limit monitoring in the workplace.

How to Improve Your Hospital’s Local Air Quality

Section five of the CAHF invites you to consider how your hospital monitors onsite air quality, and the steps you take to improve it.

We have a range of air purifiers designed for hospitals and healthcare settings which play an important role in minimising the risks of air pollution in wards and waiting rooms in hospitals where air pollution from vehicles breach legal limits.

Explore our range of air purifiers for healthcare settings.

 

 

What Air Filtration Systems are used in Hospitals?

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The 2020 pandemic highlighted the critical importance of good air filtration in medical settings. A University of Cambridge study found that an air filtration system in a Covid-19 ward successfully removed almost all traces of the airborne virus.

But what sort of air filtration system is suitable for a hospital setting? And how do hospital air filtration systems differ from the sort of systems you might find in the home?

A Quick Guide to Air Filtration in Hospitals

An off the shelf, one-size-fits-all approach to air filtration is unsuitable for a healthcare setting. Different areas of the hospital will have different requirements.

Waiting rooms and other public areas will need a good supply of clean air to prevent the spread of infections among staff and outpatients. Operating theatres and other treatment areas will have much more substantial air filtration needs. Other parts of the hospital, including laboratories and storage areas, might not handle patients directly. But good air filtration will still be necessary to reduce exposure to potentially harmful chemicals.

There’ll be strict regulations governing the hygiene standards in every area of a hospital – and these regulations will often extend to air quality. They might specify a set number of air changes per hour (ACH), for example. They might even specify the exact sort of air filtration equipment required for each healthcare setting.

What Air Filtration Systems Are Used in Hospitals?

Hospitals rely on a combination of specialist heating, ventilation and air conditioning (HVAC) systems and high-efficiency particulate air (HEPA) filters to regulate airflow, and to prevent the spread of viruses and bacteria.

Any air entering the hospital might first pass through a series of filters before it’s allowed to circulate. These filters will reduce the levels of potentially harmful particulates in the air, such as dust, pollen, and pollution from nearby roads.

In some areas, static cooling systems will cool the air without circulating it. But in areas where infection control is paramount – such as wards and operating theatres – dedicated air filters will work to trap any airborne contaminants while delivering a set number of air changes each hour.

What’s The Difference Between a Hospital Air Filtration System and a Domestic Air Filtration System?

Hospital air filters differ from the sort you might find in your home in a number of ways. They’ll likely be larger, more powerful and catch smaller particulates as they’ll need the extra performance level to suit the healthcare setting.

Hospitals might have to filter the air in a much larger space than they would in the home. But whereas you might place a domestic air filter on a surface, a hospital air filter will likely be mounted on the wall or the ceiling. This helps to maximise the amount of usable space in the room, while also making it possible to direct the flow of air to wherever it’s needed.

Healthcare air filtration systems are also likely to be much more powerful, as effective infection control in a healthcare setting often depends on a substantial number of air changes per hour.

Lastly, hospital air purification systems often use much finer filters. An air filtration system in the home is designed to capture dust, pet dander, and other common pollutants. But an air filtration system in the hospital will be capable of removing much smaller contaminants – such as viruses.

Examples of Air Filtration Systems for Healthcare Settings

Our range of HealthProtect air purifiers are specifically designed for hospitals and healthcare settings.

The BlueAir HealthProtect 7740i Air Purifier can deliver complete filtration ever 12.5 minutes in rooms as large as 62m². Its filters can trap up to 99.97% of particles down to 0.1 microns. And it doesn’t just trap tiny virus and bacteria particles – it kills them too, using a combination of low air draft and plasma charging. Meanwhile, a gentle stream of air prevents any germs from building up on the filters.

As well as stocking powerful air filtration systems for hospitals, we also offer bespoke air quality monitoring systems. We can assess the air quality of your premises and advise on a solution to help prevent exposure while ensuring both staff and patients can breathe cleaner, healthier air.

Want to talk about how we can help reduce air pollute and improve the air quality in your hospital? Get in touch to talk to one of our air purification experts today.

How Do You Test Indoor Air Quality in Hospitals, Schools and the Workplace?

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The air inside can be even more polluted than the air outside. Indoor environments can produce a number of potentially harmful pollutants. In the home, this can include dust, pet dander, and smoke particles. And unless you circulate or purify the air, all of these pollutants can linger, polluting the air you breathe in your home.

In other indoor environments – such as schools, workplaces, and hospitals – harmful chemicals from cleaning products and other substances can also linger in the air, potentially leading to some serious health conditions.

Symptoms of Indoor Air Pollution

Symptoms of indoor air pollution include headaches, nausea, sinus congestion, sneezes, coughs, irritations, fatigue, and a shortness of breath. Indoor air pollution can also make asthma, allergies, and other conditions worse.

In this post we’ll explore a few methods for testing indoor air quality. We’ll look at the sort of things you might want to test for and the sort of things you should measure. We’ll also discuss a few ways you can improve the air quality of an indoor environment.

How To Test Indoor Air Quality

There are various methods to test indoor air quality, you can either:

  • Continuously monitor an area for a set period of time – such as a day, a week, a month, or longer. This will give you a “snapshot” of an area’s air quality, which could highlight whether you should take action.
  • Perform spot checks with exposure patches. These can help you detect the presence of specific pollutants in the air. For example, many homes use small patches to test for carbon dioxide. These patches are usually light, but they darken if exposed to carbon dioxide.
  • Continuously monitor an area in real time. Rather than testing the air quality for a set period of time, you can also test the air quality on an ongoing basis. This way, you can detect the presence of harmful pollutants as they emerge, and act before they can cause any health problems.

Indicators of Poor Air Quality

You can use numerous techniques to test indoor air quality:

Be Aware of Signs and Symptoms of Mould

Mould is a reliable indicator of poor indoor air quality, and mould spores usually make their presence known. Black mould is hard to ignore, and a musty smell that doesn’t go away after cleaning is also a tell-tale sign.

You can buy mould testing kits on the high street. But these are not very useful, as there are trace amounts of mould in almost every indoor environment. Really, you should only test for mould if the problem becomes significant – with substantial black patches and a persistent smell of damp or mustiness. Certain companies offer specialist mould-testing services which can give you an accurate picture of the extent of the problem – along with clear advice on how to address it.

Unfortunately you can’t rely on your eyes and nose alone to test indoor air quality. Certain harmful pollutants, such as radon and carbon monoxide, are tasteless, colourless and odourless.

Testing for Specific Pollutants

Almost all buildings have smoke alarms, which alert you when they detect too much heat in the air, or too many smoke particles. But you should also consider fitting a carbon monoxide alarm.

If you live or work in an area with high radon levels, you could also test for radon. Radon testing usually involves testing the air quality with a specialist device for a set period of time – often around a week, but sometimes up to a year.

In some workplaces, such as hospitals, it’s important to test for other harmful pollutants, such as chlorine, entonox, phenol, and inhalable dust particles. An air quality monitoring procedure can monitor the levels of these harmful substances in the air, while exposure monitoring can help you determine just how at-risk your staff might be.

Ongoing Air Quality Testing

Cairn Technology carries out monitoring to investigate the levels of PM10, PM5, PM4, PM2.5, within multiple departments in hospitals to obtain baseline data to examine staff and public exposure to VOCs. This provides valuable information about the exposure of both staff members and public to VOCs and will assist in building a business case for the requirement of further air purification.

How to Improve Air Quality in Hospitals, Schools and Workplaces

It’s one thing to test the air quality in a room. But this can only alert you to potential problems. Actively improving the air quality of an indoor environment takes extra work

Air purifiers can filter many harmful particles, and they can even trap and remove certain airborne diseases and viruses. You can get small standalone purifiers for single rooms, as well as larger systems for larger rooms, some capable of achieving five air changes per hour. Head here to browse our range of air purifiers.

We also offer a workplace monitoring service. We can monitor your staff’s exposure levels to any potentially harmful substances in your workplace, helping you to understand your risk levels so you can devise an air quality solution that works for you. Head here to learn more about our bespoke air quality monitoring services.

 

Isoflurane – Safety, Disposal and Monitoring in Hospitals

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Isoflurane is one of the World Health Organization’s Essential Medicines. However, it can cause some adverse effects in both patients and in practitioners.

This is an essential guide to isoflurane – particularly in regard to how to store it, dispose of it, and monitor it in hospitals and other care settings.

What is Isoflurane?

Isoflurane is a general inhalation anaesthetic used as a sedative agent, and as a bronchodilator for patients with acute severe asthma. It’s non-flammable, it readily vapourises, but it’s a liquid at room temperature.

Anaesthetists always administer isoflurane in conjunction with air or pure oxygen. Though isoflurane can induce anaesthesia, anaesthetists also use it to maintain a state of general anaesthesia that’s been induced by another drug.

How Dangerous is Isoflurane?

Isoflurane can also be hazardous for practitioners. In its liquid form its irritating and corrosive, so it should never come into contact with the eyes, the skin, or any mucous membranes. And if inhaled in its vapour form, isoflurane can cause headaches, dizziness, and fatigue. Prolonged exposure can lead to chronic conditions, and even renal, hepatic, and reproductive disorders.

Some have also raised safety concerns about certain general anaesthetics, such as isoflurane, in young children. Animal studies suggest that isoflurane, when used in combination with nitrous oxide and certain other anaesthetics, may increase the risk of neurodegeneration.

There are also concerns that, with elderly patients, inhaled anaesthetics may cause brain damage that accelerates the onset of Alzheimer’s disease.

Isoflurane Safety Information

You can access all isoflurane safety information – including monitoring methods, on-site screening techniques, and all known possible side-effects – on the EMC website. Head here to access the EMC isoflurane safety information.

How to Store Isoflurane

You should store isoflurane bottles in a well-ventilated area at temperatures between 15°C and 30°C. You should return isoflurane to the storage location immediately after use, ensuring the bottles are closed tightly.

How to Dispose of Isoflurane

Treat isoflurane as a hazardous chemical waste and dispose of it accordingly. Place the waste material in a tightly-sealed container with a clear label, before disposing of it along with other chemical wastes.

How to Monitor Isoflurane Levels in Hospitals

Following a large spillage, there may be residual isoflurane levels in the environment. However, even the smallest leak from your anaesthetic machine could prove hazardous in the long-term. Workplace exposure monitoring will help meet your COSHH obligations and identify if your staff or patients are being exposed to isoflurane and other hazardous substances.

If it’s properly stored, and if your anaesthetic equipment is properly maintained, then you should have few problems with isoflurane in your health setting. However, there may be a spillage. As isoflurane is highly volatile, a small spillage can dissipate almost immediately. But you’ll have to take immediate action to clean a large spillage.

You’ll need adequate training and appropriate PPE – including respirators. You’ll also have to ventilate the area while evacuating anyone who does not have access to appropriate PPE.

We offer an expert workplace exposure monitoring service that will ensure you meet your COSHH obligations wherever your staff are exposed to hazardous substances in your care setting. This can include exposure to isoflurane.

Our fully-accredited consultants will manage the work for you, eventually providing a comprehensive report that includes discussions and recommendations based on our findings.

Head here for more information about our bespoke air quality monitoring, to talk to an expert, or to get a quote.

 

How to Measure Air Quality

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When we talk about air quality, we’re talking about how clean or polluted the air we breathe is at any given moment.

When we say the air quality is poor, it means there are pollutants in the air. These can be hazardous to breathe, especially if you have a heart or a lung condition.

The UK government determines its Daily Air Quality Index through measuring the concentration of five pollutants in a site or region:

  • Nitrogen Dioxide
  • Sulphur Dioxide
  • Ozone
  • Particulate matter – they search for two different particle sizes at once. This can include natural particles such as pollen, sea spray and desert dust, as well as human-made particles, such as vehicle emissions.

How is Air Quality Measured?

We measure air quality by measuring the relative levels of these pollutants in the air. There are two main ways to do this. One through continuous monitoring and one through monitoring periodically for days at a time.

Continuous real-time air quality monitoring: Monitoring stations can provide up-to-date data on an hourly basis, which makes it possible to determine the air quality in any given area at any given time.

Periodical air monitoring: Another way to measure air quality is to place a filter or canister in an area for a given period – such as a day, three days, or a week. At the end of this period you remove the canister and analyse the build-up of contaminants on the filter.

What Affects Air Quality?

Some sources of air pollution are natural. For example, the pollen count affects air quality, and this largely depends on the time of the year, and the weather. But it’s mainly human activity that affects air quality. And these are the activities that can have the greatest impact:

  • Burning fuel – From burning wood in domestic fireplaces, to burning fuels on an industrial level for energy generation. These practices produce small particulates as well as sulphur dioxide.
  • Road transport – Vehicle emissions contain harmful particulates, as well as other pollutants including nitrogen oxide.
  • Farming – Practices such as spreading manures, slurries, and inorganic fertilisers can create pollutants such as ammonia and non-methane volatile organic compounds (NMVOCS).

On the other hand, these are the factors that can improve air quality:

  • The weather – Air quality is generally lower on hot and still days, and higher on cool and breezy days.
  • Your location – Air quality will be considerably lower next to busy roads and junctions, and the air quality in a rural area will depend on the levels of industrial or agricultural activity in an area.
  • Ventilation – You can filter the air in a building to remove any harmful particles, and keep an area ventilated to ensure that no pollutants can build up in a closed area.

How to Improve Air Quality in Hospitals, Schools and Workplaces

Many workplaces are located in built-up areas, often close to major roads. So maintaining healthy air quality can be a constant battle. Air purifiers can filter many harmful particles, and they can even trap and remove certain airborne diseases and viruses. You can get small standalone purifiers for single rooms, as well as larger systems for larger rooms, some capable of achieving five air changes per hour. Browse our range of air purifiers for hospitals, schools and workplaces.

We also offer a workplace monitoring service. We can monitor your staff’s exposure levels to any potentially harmful substances in your workplace, helping you to understand your risk levels so you can devise an air quality solution that works for you. Head here to learn more about our bespoke air quality monitoring services.

Rising concerns over air pollution in city hospitals

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If you are concerned about unsafe pollutions levels in your hospital then you are not alone. A recent study by Kings College London and the UK Health Alliance on climate change found that 60% of hospitals and NHS facilities in inner London are in areas that exceed air pollution limits.

What’s more, the environmental campaigning network UK100 has found that more that 17% of hospitals across the UK have unsafe levels of toxic particles in the air.(1)

The issue has become so serious that the Mayor of London, Sadiq Khan, is working with ten hospitals in the most polluted areas of London to install air quality monitors that will measure levels of toxic air to help protect patients and staff.(2)

Whilst this initiative forms part of Sadiq Khan’s Breathe London project to help improve air quality in the capital, it is clear that hospitals in toxic hotspots across the UK also need to take action.

How we can help you

 

If you are looking for a way to remove pollutants trapped inside your hospital, we offer a range of Blueair air purification systems to filter the air in a variety of room sizes, from offices to waiting rooms and wards.

The range includes purifiers that can deliver 99.97% filtration efficiency, all the way down to particulate of .01 micron, not only capturing hazardous smaller particles like viruses and bacteria but also pollutants from car fumes and Volatile Organic Compounds (VOCs).

To see our range of air purifiers for hospitals click here.

Helping you to create a Clean Air Hospital

With low noise, low energy consumption and high filtration efficiency, Blueair’s air purifiers can play an important part in the creation of your clean air hospital, as laid out in the Clean Air Hospital Framework.(4)

Developed in partnership by Global Action Plan and Great Ormond Street Hospital, this framework defines a ‘Clean Air Hospital’ as one that: “Improves air quality outside and inside the hospital by minimising sources of air pollution under its control” and that develops “a clean air action plan to improve air quality.”

If you are interested in discussing how Blueair air purifiers can improve air quality in your hospital, please contact our Air Purification Team on 0845 226 0185.

Why choose Cairn Technology?

Cairn Technology Ltd has spent two decades helping hospitals across the UK to monitor and improve indoor air quality in operating theatres, anaesthetic rooms and other areas.

Until recently the majority of this work has focused on workplace monitoring of hazardous substances to ensure that they do not exceed COSHH workplace exposure limits and help hospitals take effective action where they do.

In addition, we carry out sterile services cleanroom testing, bioburden testing, and the commissioning of hospital ventilation systems.

With growing concern over the impact of air pollution in hospitals, particularly in high traffic areas, it has become a natural progression for us to also start to help hospitals to tackle this problem and create a healthier environment for patients as well as staff.

References:

(1) https://www.uk100.org/10-5-million-hospital-patients-at-risk-from-toxic-fumes/

(2) https://www.london.gov.uk/press-releases/mayoral/mayor-installs-air-quality-monitors-at-hospitals

(3) https://breathequality.com/blueair-classic-605-review/

(4) https://www.globalactionplan.org.uk/clean-air/clean-air-hospital-framework

N20 exposure risks to liver & kidneys

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Hospital employees working in areas where nitrous oxide is used to help relieve patient pain could be at risk of developing renal or liver disease, according to some studies.

An odourless and colourless gas, Nitrous oxide is a powerful analgesic in sub-anaesthetic concentrations.

Most commonly used as a 50:50 mix with oxygen, it is commonly known as Entonox.

Although the patient inhales the N20 through a demand valve, when they breathe out some of the nitrous oxide is released back into the room. This can put care staff at risk of prolonged exposure, especially in poorly ventilated rooms.

Effects of N2O on liver and kidneys

Whilst some studies have found an increased risk of liver and kidney disease in medical personnel, these findings have not been consistent across all studies.

For example, whilst retrospective cohort studies ASA 1974, Cohen et al. 1975, 1980, Spence and Knill-Jones 1978 found an increased risk of liver disease and another study, ASA 1974, Cohen et al. 1980, found an increased risk of kidney disease in women only, other studies by Lauwerys et al. 1981 and Lew 1979 found no increased risk.

So whilst there is no need to panic about these risks to staff when working with N20, it is important that you put in place measures to minimise the risk of them suffering these diseases due to their working environment.

Protecting staff from N2O exposure

The best way to ensure that you do not run the risk of your staff being exposed to hazardous levels of Nitrous Oxide is to carry out workplace exposure monitoring.

This will enable you to comply with the Control of Substances Hazardous to Health regulations which require you to monitor and record staff exposure to Nitrous Oxide against Workplace Exposure Limits set out by the Health & Safety Commission.

Workplace exposure monitoring can be implemented easily by attaching a personal sampling tube attached to employee clothing close to their breathing zone for the duration of a shift. This tube can then be analysed and a report produced from the findings.

If dangerous levels of exposure are detected, you can then tackle this problem and bring exposure levels down to permissible levels.

Of course, as well as investing in personal sampling, you should also carry out good housekeeping on an ongoing basis. Make sure Entonox equipment is well-maintained to help prevent the risk of leaks and ensure that any ventilation or scavenging systems are functioning properly.

For information on Cairn Technology’s personal sampling service for Nitrous Oxide just click here or call 0845 226 0185 and ask for our workplace monitoring team or email them at info@cairntechnology.com