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Radon Gas and Indoor Air Quality Specialist Europe 

Radon Gas, the silent killer, yet unknown by many.  Updated situation in mainland Spain.

Radon, the enemy may be in your house
Almost 300,000 homes in Spain are exposed to high levels of radon, a gas that is the second cause of lung cancer after tobacco. In Spain, around 1,600 people die each year from breathing in radioactive particles in their homes.

The Radon map shows a higher concentration of indoor radon gas in the yellow to brown areas, the white areas are either low population, or yet to be mapped, it does not indicate they are free of radon gas.  As a broad guide, properties near sea level have less risk, a little back inland in rocky terrain above the coastline and the levels are higher.

Radon Map Spain

There has been much discussion as to what is a safe level of radon gas in a home.  In short, no level is a safe level as radon is a dangerous radioactive gas.  Even in properties where the levels are low, the internal environment of a home can effect the buildup of gas.  Poor indoor air quality where levels of high humidity creates heavy air layers, especially in basements and under builds, keeping the gas low and allowing a buildup to a dangerous level.

Testing for Radon.  As so many indoor elements can effect the test outcome, I believe there is really only one way to undertake a radon check professionally, that is with a physical hands on survey.  The practice of mailing small cheap chemical censors and asking the home owner to place censors in various rooms then monitoring remotely, is not the answer.  

A full property survey is required, both internally and externally.  Air quality levels need to be checked to ensure the humidity levers are correct as at a constant value of radon concentration, measured values have been found to increase linearly with increasing humidity, from 30% RH up to a value of ∼85% RH.  So any measurement of radon levels in high humidity could be up to 300% inaccurate.  Furthermore, I have found that placed sensors and installed smart home monitors can be greatly effected by indoor pollution, such as gasses produced from spores, mould and bacteria.

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