Quality of rivers vis-à-vis pesticides (average concentration) in Brittany

This map represents the distribution of Breton measuring stations attached to the RCS, RCO, FRGSURR, departmental networks, RCALB and RBESUQLBREF water monitoring networks for the pesticide parameter, and for which data are banked in OSUR (April 2013 export). For each measuring station, the mean concentration is determined for 2012 with all available analyses. __Origin__ The source data came from a BDD OSUR (AELB) export in April 2013. The stations are linked to the RCS, RCO, FRGSURR, Departmental Networks, RCALB and RBESUQLBREF networks. The average pesticide concentration corresponds to the sum of quantified analyses, for all substances, averaged over the year (arithmetic average). The analyses used for the calculation of the average pesticide concentration are those with a result above the quantification threshold and below the saturation threshold, or the result is 0 (Anal_Remark_Code 1). Thresholds for restoring average pesticide concentrations (µg/l — mean over all quantified analyses), by station and per year: * equal to or greater than 5 μg/l — black * equal to or greater than 0.5 and less than 5 μg/l — dark green * 0.1 and less than 0.5μg/l — green * less than 0.1 μg/l — light green __Partner organisations__ Observatory of l’' environment in Brittany [See this page on geo.data.gouv.fr](https://geo.data.gouv.fr/fr/datasets/ad84b69b606cde516be810497f46b880f37f5893)