Odour pollution is the second cause of environmental complaints by citizens across Europe, and often a symptom of broader environmental issues caused by population growth, urbanisation and industrialization. The need for action is becoming more urgent with the growing recognition at all levels of the harmful effects of bad air quality on people���s health and lives as reflected in the EU Action Plan: ���Towards Zero Pollution for Air, Water and Soil��� of the European Green Deal. However, odour regulations across Europe and within countries differ significantly from each other. In many places they are even completely lacking. The Green Paper on Odour Pollution advocates for the need of a bottom-up, multi-level governance model in odour pollution within Europe in order to protect the affected citizens and support the environmental authorities and emitting activities in order to improve the situation. The Green Paper on Odour Pollution is the first attempt in the development of such a set of recommendations to tackle odour pollution at the local, regional, national and global levels and aims to provoke an open discussion on the approach to tackle odour pollution. The document reviews the overall odour measurement techniques and the policy framework for action on odour pollution. It proposes methods and recommendations for the reduction of odour impacts as well as encouragement for its legislation.