Indoor air quality surveys vital for business reopening amid new guidance, says Bureau Veritas

by Francesca

Following the latest guidance from the Health and Safety Executive (HSE) highlighting the risks of coronavirus transmission in air conditioning and ventilation systems, Bureau Veritas is stressing the need to carry out indoor air quality surveys, swab-sampling programs and quantification of fresh air assessments, to ensure the premises mitigate any risks in relation to the transmission of COVID-19.

The HSE guidance comes as many businesses prepare to re-open following two months of national lockdown and urges them to check that they have adequate air conditioning and ventilation systems in place, to ensure all areas of their premises are adequately ventilated to limit transmission of COVID-19 aerosol particles.

Those in the hospitality industry, non-essential retail and a number of other commercial buildings having closed to the public throughout the national lockdown and as they once again are faced with the well-versed processes of re-opening, Bureau Veritas assets that clean air and circulation in indoor venues should be a key part of their strategy as we exit national lockdown.

Joe Marais, Engineering Team Leader – Occupational Hygiene at Bureau Veritas, comments: “There are two ways a business can adequately ventilate their premises. First is natural ventilation, such as opening doors and windows.
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However, a number of buildings also use mechanical ventilation, these are air handling (AHUs) and air conditioning units that control temperature, humidity, air movement and cleanliness within a space.

“The vast majority of AHUs are capable of introducing fresh outside air, mixed with a proportion of recycled air back into occupied areas. The key issue that we have found is that the fresh air ratio setting on AHUs has been drastically turned down due to the need to recycle air for thermal comfort. The latest guidance from HSE is discouraging the use of 100% recirculation system settings and is encouraging the supply of fresh outdoor air too.”

While the most common form of COVID-19 transmission is through large particles or ‘droplets’, which are let off into the air via sneezing, coughing and breathing and eventually settle on a surface, there is evidence to suggest that the virus can be spread by smaller particles called aerosols, which can remain airborne for several hours.1 It is these particles that pose the risk when indoor air is recirculated through an AHU.

Joe continues: “While we’re all aware of the danger of coronavirus transmission via droplets and are regimented in social distancing and hand sanitising to prevent the spread, it can’t be forgotten that the virus can also spread via airborne particles, and thus the onus is on businesses to ensure all procedures are met to mitigate these risks for employees, visitors and customers.

“This can best be done by carrying out indoor air quality surveys to ensure that each area of the premises is well-ventilated, looking at where natural ventilation can be incorporated, as well as swab testing samples to assess whether the air that is being recirculated is free from harmful pathogens, especially the COVID-19 virus.

“Experts from our Occupational Hygiene team recently completed and in-depth assessment of AHUs and indoor air quality for a leading supermarket chain. The results of these air monitoring assessments were considered alongside other control measures currently in place throughout all UK stores, including social distancing, masks and the provision of hand sanitiser. In addition, our team took swab samples at two specific locations in each store to determine the presence or absence of the SARS-CoV-2 coronavirus gene.

“The result was an independent risk assessment and verification, on which our client could make a more informed decision over the risk of air recirculation in sales areas during the COVID-19 pandemic, as well as a comprehensive report containing the results of independent assessments on all five AHU variants.”

Bureau Veritas’ experienced Occupational Hygiene division has a longstanding history is supporting businesses to protect staff and customers from exposure to substances hazardous to health, as well as maintaining compliance with relevant regulations. The firm’s hygienists will assess, monitor and evaluate a business’ actual or potential exposure risk from hazardous agents and provide sound advice on how to control these risks, allowing businesses to operate effectively and efficiently whilst protecting health and achieving compliance.

To find out more about Bureau Veritas’ Occupational Health services or to discuss individual requirements with a member of the team, call 0345 600 1828 or visit

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