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2. Regional Office for Europe: World Health Organization;WHO;Guidel. Indoor Air Qual. Sel. Pollut.,2010
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4. UBA research project, 2023, "Determination of odour perception thresholds of indoor air pollutants (in German), FKZ 3717 61 250 0". Umwelt & Gesundheit, German Environment Agency (UBA). (https://www.umweltbundesamt.de/search/content/geruchsschwellen?keys=geruchsschwellen).
5. CEN. 2022. EN 13725:2022. Stationary Source Emissions. Determination of Odour Concentration by Dynamic Olfactometry and Odour Emission Rate. Brussels.