The demand for CO and CO₂ monitoring is driven by a tightening regulatory landscape and a shift in how we define healthy indoor environments.
In England, CO safety laws were strengthened in October 2022. Landlords are now required to install CO alarms in rooms with fixed combustion appliances, such as boilers or wood burners; gas cookers are still a significant exception to the rule.
This change is part of a larger trend towards stricter safety standards across the UK. Similar mandates took effect in Scotland in February 2022 and Wales in December 2022. Northern Ireland is also introducing new private tenancy rules, applying to new tenancies from September 2024 and existing ones by December 2024.
On an international scale, exact regulations in the EU and the US vary by jurisdiction; they are often based on established safety standards. In Europe, this typically refers to the EN 50291 standard, while in the US, requirements are often driven by model codes such as the International Residential Code (IRC).
What is Carbon Monoxide?
Carbon monoxide is a colourless, odourless, and potentially life-threatening hazard. Classified by the World Health Organisation (WHO) as a byproduct of incomplete combustion, CO exposure can lead to severe neurological damage or death.
What is Carbon Dioxide?
Unlike CO, monitoring CO₂ is primarily a tool for ventilation assessment rather than a direct toxic threat. The UK Health and Safety Executive (HSE) identifies CO₂ levels as a key indicator of indoor air quality; concentrations consistently exceeding 1500 ppm typically indicate inadequate fresh air circulation, which can impair occupant concentration and comfort.
Its use has expanded rapidly beyond industrial settings:
- Education Sector: Government-led initiatives have introduced CO₂ monitors in schools to help manage ventilation.
- Efficiency Standards: Bodies like ASHRAE now promote CO₂ monitoring as the backbone of Demand-Controlled Ventilation (DCV), allowing buildings to balance air quality with energy efficiency.
Conclusion
As expectations for indoor environments evolve, facilities teams are moving toward more proactive, data-driven approaches. Integrating CO and CO₂ monitoring into everyday building management, rather than treating it as a standalone task. Supporting compliance, improving occupant wellbeing, and contributing to wider sustainability goals.
