POPs GMP data visualization and analysis

Content analysis of GMP regional reports

Important note: Review presented at this page is related to original five GMP regional reports as adopted by the fourth meeting of the Conference of the Parties in May 2009. In contrast to on-line data visualization, the analysis does not include additional data from monitoring programmes and surveys.

The first step in the analysis of the regional GMP reports was to determine the relation of all reported parameters to the Stockholm Convention. The classification strictly followed scope of the Stockholm Convention and the GMP Guidance document and their amendments in time. Considerations were also given to the reported data content and relevance of existing records for further data collection.

Overview of chemicals identified in GMP reports

Fig. 1. Overview of chemicals identified in GMP reports

  1. 12 initial POPs included in the Stockholm Convention in 2001, their congeners, isomers and degradation products specified in the GMP Guidance document (2007)
    - 58 parameters
  2. Additional 10 POPs listed in the Stockholm Convention in 2009 and 2011 and specified in the updated GMP Guidance document (version 2009)
    - 7 parameters
  3. All other compounds, their sums and toxic equivalents related to the Stockholm Convention but not specified in any of the GMP Guidance documents
    - 84 parameters
  4. Compounds found in the GMP reports but not related to the Stockholm Convention (i.e. PAHs)
    - 22 parameters

Analysis also revealed a significant variability in the range of chemicals reported from individual UN regions. Out of 42 parameters found in all regional reports, 38 parameters (mostly related to the PCDDs/Fs congeners) are recommended in the GMP Guidance document.

Regarding the parameter distribution over matrices, there were just 20 parameters that were reported in all matrices, eleven of those parameters are the individual compounds included in the GMP Guidance and three are related the additional 10 POPs (alpha-HCH, beta-HCH and gamma-HCH).

Data reliability and completeness

Performed analysis of the GMP data is fully in line with tasks that members of the Global Monitoring Plan Core Group (GMP CG) identified as priority steps in order to improve guidance for GMP2.

The following list contains challenges encountered when reviewing the GMP reported data:

  • Limited standardization of the used nomenclature (i.e. trans-chlordane vs. gamma-chlordane or o,p‘-DDD vs. o,p-DDD);
  • Reporting parameters without specification of the isomers or degradation products summed up (“chlordanes”, “PCBs”, “DDTs”, “heptachlor“);
  • Difference in labelling of PCBs sums;
  • Limit of Quantification (LOQ) not reported;
  • Unclear reporting or missing definition of units;
  • Ambient air data reported as spatially aggregated values, often without specific information on number and type of sampling site;
  • Missing or wrong specification of the TEF values used for calculation of the TEQ (year). Various WHO-TEQ values used (WHO-TEQ 1995, 1997, 1998, 2001, 2005)

All issues mentioned above significantly influence the reliability of collected GMP1 data and narrows data pool that can be subsequently used for future comparisons. The discrepancies and uncertainties of reported data originated in a lack of intercalibration of reporting processes among various countries and regions and standardization of reporting format.

The challenges encountered in analysis listed above confirm the need to further specify methodology and format for reporting of the data in future data collection campaigns.


Last update: 18 January 2013