The weighting factors for the three pillars are in accordance with UNE-EN 16578 (Annex B, chart B.4): Factor 3 for Pillar 1 (e.g. raw material, transport, production and transport to the market). Factor 2 for Pillar 2 (e.g. water and energy consumption). Factor 1 for Pillar 3 (e.g. cleaning and noise). For assessment purposes, the analysed products have been grou- ped into categories, considering that the result of the assessment of any product in the category is representative for all products in the same category. The final results are presented according to the evaluation scheme established in UNE-EN 16578 Annex B, from S1 to S7, with S7 being the highest level. Environmental product declaration. Vitreous china.