The ranking of contaminants is calculated on the basis of the frequency a specific contaminant is reported to be the most important in the investigated sites: Ranking = (number of countries reporting the specific contaminant as the most important)*2 + (number of countries reporting the specific contaminant as the second most important). Maximum possible score: 37 Data for Belgium refer to the Flanders and the Brussels region only. Data for Italy refer to three out of 20 regions only. Data Coverage: Austria, Belgium, Czech Republic, Finland, FYR of Macedonia, Greece, Hungary, Italy, Luxembourg, Macedonia, Slovakia, Spain, Sweden Time coverage: 2006
