Monitoring of total phosphorus in the Contracting Parties of HELCOM is described on a general level in the HELCOM Monitoring Manual in the sub-programme: Nutrients
Monitoring guidelines specifying the sampling strategy are adopted and published.
The monitoring activities relevant to the indicator that are currently carried out by HELCOM Contracting Parties are described in the HELCOM Monitoring Manual sub-programme: Nutrients.
For assessment purposes, at least 15 status observations should be conducted annually during the period January to December in each open sea assessment unit. The compilation of observations is expected to be distributed spatially within the assessment unit in a non-biased way. In coastal areas, at least monthly sampling of representative stations is desirable.