Organic persistent toxic substances in soils, waters and sediments along an altitudinal gradient at Mt. Sagarmatha, Himalayas, Nepal

► POPs were measured in environmental samples from remote lakes in the Himalaya ridge. ► It was confirmed the hypothesis of Long-Range Atmospheric Transport for lighter POPs. ► PAH levels in Himalayan samples must be considered as low to medium contaminated. ► The stations can be considered undisturbed remote areas concerning PCB, PBDE and OCC.