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 For heavy metal and POP (Persistent Organic Pollutants) emissions, the picture is far more heterogeneous: While the release of these substances generally declined, some trends appear to be less favourable. Generally, data completeness and inventory compatibility remains an issue for these pollutants. For the three priority heavy metals cadmium, mercury, and lead, however, very significant reductions have been achieved in the 1990s (see figure below). For heavy metal and POP (Persistent Organic Pollutants) emissions, the picture is far more heterogeneous: While the release of these substances generally declined, some trends appear to be less favourable. Generally, data completeness and inventory compatibility remains an issue for these pollutants. For the three priority heavy metals cadmium, mercury, and lead, however, very significant reductions have been achieved in the 1990s (see figure below).
  
-{{ :general:trends:iir_hm_2025_top3.png?direct&800 | emission trends for the three heavy metals cadmium, mercury and lead}}+{{ :general:trends:iir_hm_top3.png?direct&800 | emission trends for the three heavy metals cadmium, mercury and lead}}
  
 All trends are analysed and explained in detail in the [[general:trends:start|Chapter 2 - Explanation of Key Trends]]. All trends are analysed and explained in detail in the [[general:trends:start|Chapter 2 - Explanation of Key Trends]].