On 01 March 2021 the World Health Organization (WHO) published the ‘Roadmap to improve and ensure good ventilation in the context of COVID-19’ with the intention of providing a globally adopted reference in the best interests of public health and creating awareness for good ventilation practices. The first edition of the publication referenced outdated and obsolete standards, therefore Eurovent supported by Eurovent Middle East, submitted official recommendations to the WHO to revise the references. On 13 April 2021, a corrigendum was published by the WHO to withdraw the obsolete references in the publication. Eurovent Middle East recommends exclusive use of ISO 16890 as the global standard for air filter classification.