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1: Continente | 59 | 18 | 23 | 2: Região Autónoma dos Açores | 90 | 9 | 1 | 3: Região Autónoma da Madeira | 100 | 0 | 0 | Proportion of groundwater quality monitoring stations (%) by Nitrates concentration class; Quadrennial - Portuguese Environment Agency |
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This data last updated:december 22, 2020
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