Dear Elena,

Regarding to your question, I think the influence of outdoor radon gas on indoor air quality is not a serious problem. However, the indoor source of radon gas, e.g., stones used indoor, may be a problem, as the outdoor radon gas is not in high concentration level for most cases.

Usually, we more concern those serious atmospheric pollutions, which may impact indoor air quality due to air change between indoor and outdoor air. For instance, particulate matter is usually a critical point for indoor outdoor air relationship. I attached one review for your reference.

Best,

Article Review of relationship between indoor and outdoor particles:...

Dear Elena,

Radon concentrations in outdoor air are often low, at least compared to the concentrations in soil. These are some factor 10000 higher. It is therefore important to know what type of soil your house is on. In the Netherlands most of the soil is from sedimentary origin and the radon exhalation from that soil is relatively low. In more mountainous areas (for instance the Alps) exhalation rates are often much higher. Now, if your house has a low ventilation rate and you have cracks or for instance openings around gas and electricity conduits in your groundfloor, you could end up with a high radon concentration indoors. In those cases it is important to seal your groundfloor (make it radon proof) and improve your ventilation. Sometimes it might be necessary to suck the air from under your house using a sump to prevent it from entering your house.

Below you will find a link to a recent IAEA document that also has radon information on Romania. There is a world of information on radon, but you have to start somewhere.

Best regards,

Roelf Blaauboer

http://www-pub.iaea.org/books/IAEABooks/11131/Status-of-Radon-Related-Activities-in-Member-States-Participating-in-Technical-Cooperation-Projects-in-Europe

I received very good responses at my question and I have to appreciate this. My concern goes further in building designs, even building materials used in designs, as I try to make or be harmonious with correlation between source of pollution with radon gas and indoor accumulation of particular concentrations of radon gas. Usually the source of pollution is in outdoor and the exposure to radon is in indoor. For scenarios with energy efficient buildings can I have views with indoor accumulation?

Have an idea here too..Elena..Best

https://nepis.epa.gov/Exe/ZyNET.exe/30004KZ6.TXT?ZyActionD=ZyDocument&Client=EPA&Index=1991+Thru+1994&Docs=&Query=&Time=&EndTime=&SearchMethod=1&TocRestrict=n&Toc=&TocEntry=&QField=&QFieldYear=&QFieldMonth=&QFieldDay=&IntQFieldOp=0&ExtQFieldOp=0&XmlQuery=&File=D%3A%5Czyfiles%5CIndex%20Data%5C91thru94%5CTxt%5C00000005%5C30004KZ6.txt&User=ANONYMOUS&Password=anonymous&SortMethod=h%7C-&MaximumDocuments=1&FuzzyDegree=0&ImageQuality=r75g8/r75g8/x150y150g16/i425&Display=hpfr&DefSeekPage=x&SearchBack=ZyActionL&Back=ZyActionS&BackDesc=Results%20page&MaximumPages=1&ZyEntry=1&SeekPage=x&ZyPURL

Thank you dear Surender Singh, Unfortunately you put only first page, but my concern is about efficient buildings in views that I need.

Normally, the main source of radon concentration in indoor air is coming from the ground by radon diffusion and air leakages. Thus, one should ensure that the floor of the building has a high radon diffusion resistance and as small air leakage (preferably close to zero) as possible. Proper ventilation of the rooms in the building will reduce the indoor radon concentration. See for example these two articles written by me (may be requested through Research Gate): (a) B. P. Jelle, K. Noreng, T. H. Erichsen and T. Strand, ”Implementation of Radon Barriers, Model Development and Calculation of Radon Concentration in Indoor Air”, Journal of Building Physics, 34, 195-222, 2011, and, (b) B. P. Jelle, ”Development of a Model for Radon Concentration in Indoor Air”, Science of the Total Environment, 416, 343-350, 2012.