The MBT plant in Onda generates 200 t of RF per day. This plant works six days a week, as there is no production on Sundays. The sampling process was carried out during the months of April, May and June (spring season). Some representative samples were taken in two non-consecutive weeks. The weeks were chosen taking into account that there were no special events in them that could distort the results. Thus, twelve samples were taken, which correspond to 14 days' MSW generation.