The latest publication from Felicioni et al. at the Czech Technical University in Prague is titled “An Environmental Evaluation of Ventilation Systems Aimed at Reducing Indoor Radon Concentration”. The study evaluated the environmental impact of residential ventilation systems for lowering radon concentrations indoors. Increases in radon supply rates led directly to increases in energy consumption and related emissions. The results showed that ventilation systems cannot be considered universally suitable measures since they can have a highly adverse environmental impact due to their energy expenditure considering the type of energy source. The paper provides recommendations for energy-efficient and therefore environmentally‑friendly solutions when considering ventilation systems for radon mitigation. More papers can be found on the RadoNorm website.