External pollution

Atmospheric pollution, pollutants caused by traffic, heating, industrial and craft activity, industrial and human accidents (N2O, CO, O3, particles etc.) and the combination of industrial pollution and particular natural conditions.

Natural allergens from the soil, vegetation (pollen, spores etc.) and external mould.

Various breathable particles and semi-volatile compounds, living particles (bacteria, viruses,
microscopic fungi etc.), mineral particles (sea spray, rock corrosion, soil erosion etc.), biocides, pesticides
etc.

Radon: the most dangerous carcinogenic pollutant
A naturally-occurring, odourless, colourless radioactive gas given off by certain sub-surface rocks and, to a lesser extent, by building materials.

VMI® : PROVEN EFFECTIVENESS AGAINST RADON

« The installation of your VMI® in the primary school in Chardonnerets de Valentigny in July 2007 has produced excellent results. In fact, during the radon measurement campaign in the establishment between 28 February and 4 May 2006 the concentration, depending on the classroom, was from 527 Bq/m3 to 1087 Bq/m3. After your equipment was installed (1 per classroom volume = 230 m3), the measurements made between 31 July and 28 August 2007 revealed a concentration of between 27 Bq/m3
and 72 Bq/m3 depending on the classroom. It should be noted that these values are considerably lower than the first action threshold of 400 Bq/m3. »

R. GAMBERI, Assistant for public works and roads, for the town of Valentigney