The Dutch mushroom industry uses closed or indoor composting to avoid high concentrations of odor components, unlike many other countries that still use open composting. The average CO2 footprint of mushrooms is relatively low compared to other vegetables, with 1.22 kilos of CO2 equivalent per kilo of white mushroom for industry production and 1.56 kilos for the fresh market. The mapping of the mushroom sector's CO2 footprint is driven by the growing demand for sustainable products, both in the Netherlands and internationally, allowing exporters and processors to provide accurate sustainability information to customers.