Fig. 2From: Smokers’ behaviour and the toxicity of cigarette filters to aquatic life: a multidisciplinary studyOverview map showing observation sites 1–4 in the city centre of Gothenburg, Sweden [60]. Sites are outlined by a blue line. Site 1 = public square Järntorget, site 2 = public square Brunnsparken, site 3 = public square Drottningtorget, site 4 = entrance to shopping centre NordstanBack to article page