However, considering the uncertainties of the assessment (variability of conversion factors, assumptions on flooring lifetime, lack of conventional cleaning procedures, etc.) which can lead to very different results (emission levels up to five times higher or lower depending on assumptions), and the fact that Tarkett has no control and limited influence on the type of equipment and cleaning protocol used by its diverse customers (floor cleaning is only an indirect use of the product, while being necessary for all types of flooring), we do not consider this category as the most critical compared to other sources of emissions on which Tarkett has greater leverage.