Spring is the season of fresh starts.
Windows are opened and attention turns to improving indoor spaces after the winter months. From deep cleaning and decluttering to decorating and home improvements, it’s a time focused on creating healthier, more comfortable environments.
But while most spring-cleaning checklists focus on what you can see, there’s one important factor that is often overlooked:
radon gas.
Awareness of radon is growing across the UK, particularly as more is understood about its impact on health and its presence in homes and workplaces. But despite this, it’s still rarely considered as part of routine property maintenance, even during a time when people are actively trying to improve their indoor environment.
And when it is considered, spring can present an unexpected challenge.
The Hidden Risk Behind “Fresh Air”
Radon is a naturally occurring radioactive gas that enters buildings from the ground below. It is invisible, odourless and cannot be detected without testing.
Unlike many other indoor risks, radon levels are not constant. They fluctuate based on factors such as:
- ventilation
- temperature
- building use
- seasonal conditions
Which means the time of year you test can influence the results.
Why Radon Levels Are Often Lower in Spring
As the weather improves, buildings begin to behave differently.
During spring and summer months:
- windows and doors are opened more frequently
- ventilation naturally increases
- heating systems are used less
These changes can reduce indoor radon concentrations, as the gas is more easily diluted and dispersed.
While this might seem like a positive, it can also create a misleading picture of the true radon levels within a property.
The Risk of Short-Term Testing
If radon testing is carried out over a short period during spring, results may appear lower than they would at other times of the year, particularly in winter, when:
- buildings are more sealed
- ventilation is reduced
- heating systems are used more consistently
As a result, short-term testing at this time of year may underestimate the true annual average radon level.
This can lead to a false sense of reassurance, especially if results appear comfortably below action levels.
Why Long-Term Testing Matters
This is why UK guidance recommends testing over a minimum period of three months wherever possible.
A longer-term test:
- captures natural fluctuations in radon levels
- reflects changes in weather and occupancy
- provides sufficient data to apply a seasonal correction factor to, to estimated the annual average concentration
Put simply, it gives a far more reliable understanding of radon risk.
Don’t Let the Season Skew the Results
If you’re thinking about radon this spring, consider:
- Is your test long enough to capture seasonal variation and allow a seasonal correction factor to be applied?
- Will the results reflect year-round conditions?
- Do you fully understand what the results mean?
Because when it comes to radon, it’s not just about testing, it’s about testing properly.
The Role of Expert Guidance
For workplaces, larger properties, or multi-site estates, radon assessment can be more complex.
Factors such as building layout, ventilation systems and patterns of use all influence how radon behaves indoors.
Working with a specialist helps ensure:
- the correct testing approach is used
- detectors are placed appropriately
- results are reviewed in line with UK guidance
A Smarter Approach to Spring Cleaning
Spring cleaning is about creating a healthier indoor environment.
But when it comes to radon, what feels like a “fresh” space may not reflect how the building performs year-round.
Including radon in your spring checklist is a positive step, but testing properly is what makes that step meaningful.
Ready to Add Radon to Your Spring Checklist?
PropertECO provides validated laboratory radon testing and expert guidance to ensure results are accurate, representative and actionable.
Whether you’re testing a home, workplace or wider mixed estate, we can help you gain a clear understanding of radon risk, whatever the season.
Get in touch today to discuss your radon testing requirements
