Chile is now undertaking the preparation of three odour regulations for: Swine's farms, the sea products processing plants and it has started the process of reviewing the emission standard for pulp mills. Carrying out regulatory processes to solve the issue of annoying odours is not an easy job, because it has different characteristics compared to the rest of the atmospheric pollutants.

   However, the development of normative processes in Chile has so far provided important learning instances for each of the obstacles that have had to be overcome. Thus, the main objective of this work is to disseminate three lessons learned from the odour standards development processes in Chile. The results of this work are expected to contribute to other normative processes that will be initiated, particularly in Latin American countries.

   Last December, a new legislation in air quality came into force in Germany. This is, to our knowledge, the first general limit of odour in ambient air in any country of Europe as it applies to any activity that is potential odour pollutant and to all sectors.

   That is, since the first of December 2021, Germany has a regulatory limit of 1 odour hour in ambient air that cannot be exceeded more than 876 hours a year in residential areas. Also, for industrial and rural areas, the limit of 1 odour hour cannot be exceeded more than 1314 hours every year.