Masks effectiveness

I assume that you refer to list published in the article EU standards for protective equipment – available now for free https://advisera.com/13485academy/blog/2020/04/14/free-access-to-iso-13485/

On that standard list, there are two standards for masks: one for classic surgical masks and one for respiratory masks FFP. According to the guidelines from the World health organization on the day April 5th, 2020, regular surgical masks are effective protection against COVID-19: https://www.who.int/emergencies/diseases/novel-coronavirus-2019/advice-for-public/when-and-how-to-use-masks. 

For that surgical masks is applicable standard EN 14683:2019 + AC:2019 Medical face masks – Requirements and test method. For respiratory masks applicable standard is N 149 + A1:2009 Respiratory protective devices – Filtering half masks to protect against particles – Requirements, testing, marking (commonly referred to as ‘FFP masks’).