Mongolia is facing various environmental health challenges due to rapid economic growth especially the mining sector, rapid migration from rural to urban areas, severe climatic conditions and climate change. Some of these environmental risk factors are traditional in nature such as low coverage of safe drinking water and improved sanitation services, but some are emerging such as urban air pollution, and impact from the mining sector and climate change. Hence the WHO Country Cooperation Strategy (CCS) has identified environmental health as one of the five priority areas of collaboration with Government of Mongolia, in particular with the Ministry of Health, Ministry of Environment, Green Development and the City of Ulaanbaatar. It is pertinent to prioritize these environmental health challenges and develop short and long-term strategies to address these challenges. National Environmental Health Programme is in its second phase of implementation for the period of 2011-2015.