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The first Europe-wide study including 21 countries revealed a picture of distinct geographical and temporal patterns of drug use across European cities. This interactive lets you explore the data (see below map for more instructions and important notes on interpreting the data).

Select a year:

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Select a day:

Click anywhere on the map to zoom out

Click on a location to zoom in


How to use this map? By scrolling over the bubbles, the city name and data become visible. To further explore the findings of the study, select the ‘target drug’ and the ‘temporal pattern’ of choice. Weekend means refer to the mean loads detected on Friday, Saturday, Sunday and Monday. Weekday means refer to mean loads detected on the other days of the week. It is also possible to zoom in on your country/city of interest and explore the findings for the different drugs and different time periods. Both the findings from 2012 and 2013 are included in this map. Bubble sizes are not comparable between different target drugs, but are comparable within one substance.

Additional notes:

MDMA - 2012/2013: Eindhoven exhibited abnormal high values for MDMA in 2012 and 2013, which might be due to the release of unconsumed MDMA into the sewer syste.

Amphetamine 2013: Eindhoven exhibited abnormal high values for amphetamine in 2013 (Ort et al., 2014).

Contact details for Zurich: Water and Soil Protection Laboratory and Swiss Federal Institute of Aquatic Science and Technology (Eawag)

Supported browsers

Please note that this interactive feature requires a recent browser. Older browsers, in particular versions of Internet Explorer prior to 10, may not function correctly.

Page last updated: Wednesday, 03 June 2015