All values indicate the amount of drug residues found in wastewater. The milligrams refers to the amount of the drug found in the wastewater 1000 people produce on average.No values were corrected with excretion factors. The sampling occurred in various processing plants and does not necessarily cover the whole cities' area. The term Meth used in the graphic corresponds to the substance Methamphetamine, as defined by the International Non-Proprietary Name classification. The term Speed used in the graphic corresponds to the substance Amphetamine, as defined by the International Non-Proprietary Name classification. The ranking figure per each city always uses the most recent data available.