[en] This article highlights the advantages of biofuels including the low sulphur content, the small amount of nitrogen dioxide and dust released on combustion, the reduced health risk, the renewability of biofuels, the possible collection of trace metals from the soil by biofuels, and no long term impact on the amount of carbon dioxide in the atmosphere. The disadvantages of the more expensive biofuel are also noted. (UK)

[en] Various procedures to limit the concentration of radon in 10 small houses have been tested. In five cases the filling around the basement was replaced to a distance of 4 meters. The inflow of radon was then reduced by 30-90%. A combination of ventilating by 0,5 air renewals per hour and replacement of the filling reduced the inflow by 90-99%. The cost, however, was high. Houses made of lightweight concrete containing shale were put right by increased ventilation. Two houses were re-papered with aluminium foils and the emission of radon from the building material was reduced by 60%. (G.B.)