Sirens and schools in the Netherlands

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The map shows 23 sirens, locations from the municipality of Nijmegen, and 39 elementary schools, locations from the national government. All schools are located within 1 km of a siren.

Source: http://www.arcgis.com/home/webmap/viewer.html?webmap=f05b3ab96a3c407b80c117a007f57ee5&extent=5.745,51.7918,5.9225,51.8789