Abstract: Abstract: The present invention concerns an accessory device for face coverings, surgical masks and filtering facepieces, which performs the dual function of a diffuser, in particular of fragrances and scents to neutralise unpleasant odours that may form in the area in front of the user’s mouth, and also as a sign of recognition of its own mask by the user.

Abstract: A gas analysis system for engaging a sealed container to withdraw and analyze gas from the sealed container, the system comprising: a penetration implement configured to create an opening to permit withdrawal of gas from the container; a chamber operatively coupled to the penetration implement for receiving gas from the container; a gas analyzer; a seal configured to engage the container to enable the system to maintain an enclosed volume comprising the chamber and an interior of the container after the penetration implement has created an opening in the container; and a mechanism to effect flow of gas from the container to the chamber, and thereafter from the chamber to the gas analyzer, the mechanism comprising a first valve operatively coupled to the penetration implement, and a connection pipe configured to connect with the gas analyzer; wherein the first valve is movable between a first position in which it permits flow of gas from the container to the chamber, and prevents gas from escaping from the enc