This core indicator evaluates the status of the marine environment based on concentrations of the tributyltin (TBT) and its breakdown products dibutyltin (DBT) and monobutyltin (MBT) in biota (mussels, marine gastropods). Imposex effects of TBT on marine gastropods are used as another source of data on TBT. Quantitative thresholds are used to classify core indicators status in "Achieve", "Fail" or "Not assessed". Good status is achieved when the concentrations of TBT are below the threshold value.

This dataset displays the result of the indicator in HELCOM Assessment Scale 4 (Division of the Baltic Sea into 17 sub-basins and further division into coastal and off-shore areas and division of the coastal areas by WFD water types or water bodies).

Attribute specifications and units:

"HELCOM_ID" = Code of the HELCOM scale 4 assessment unit

"country": country in which the HELCOM assessment unit is located or a mention to an open sea area

"level_2" = Name of the HELCOM assessment unit in scale 2

"Name" = Name of the HELCOM assessment unit in scale 4

"Open_sea" = Name of the HELCOM assessment unit in the open sea

"F2_Name" = Name of the HELCOM assessment unit

"determinan" = Determinat

"est" = The estimated mean loge concentration in the assessment unit

"se" = The standard error on the estimated mean log concentration in the assessment unit

"fit" = The estimated mean concentration in the assessment unit

"upper_cl" = Upper one-sided 95% confidence limit on the mean concentration: exp(est + qnorm(0.95) * see)

"Status" = Overall Status of the indicator according to one-out-all-out