The first part of the article continues the discussion with the responsible regulator on the actual issues of radon regulation, such as (i) the problem of indoor radon mitigation, (ii) the problem of radon measurements and conformity assessment, (iii) the problem of public awareness and responsibility for radon control, and (iv) the problem of developing a national radon action plan. The second part of the article will be published in the next issue and will be devoted to a detailed discussion of MR 2.6.1.0333-23 in terms of indoor radon measurements in comparison with an alternative method based on rational principle of measurements.