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River Water Quality 1990–2018 — Nitrite (as N)

Per-monitoring-site mean nitrite (as n) for the 2010–2018 period, derived from DAERA's River Water Quality Monitoring 1990–2018 dataset (~141 K sample-time records aggregated to 572 active sites). Site points are coloured by mean value over the period; click any site for its full statistics…