The study, completed by mobility company Swisstraffic and published in media outlet Tages Anzeiger, surveyed approximately 10,000 people at train stations across Switzerland using video footage.
The researchers found that 94 percent of passengers travelled without masks. The most obedient passengers were in Lausanne, where approximately eight percent wore masks.
The findings come in stark contrast to the situation in neighbouring countries, where masks are compulsory on public transport – as well as in shops and some workplaces.
In Italy, masks have been compulsory since May 4th, while Germany put in place mask requirements at the end of April in all 16 states.
Masks are also compulsory in public transport across France.
Swiss parliament to debate compulsory mask requirement on June 19th
Switzerland is set to debate the introduction of a mask requirement on Friday, June 19th.
At this stage no information has been given about the requirement, however neighbouring countries have required masks in public transport, shops and some workplaces.
Daniel Dauwalder, a spokesperson for the Federal Office of Public Health, said that compulsory masks will be discussed by the Federal Council.
Swiss authorities have been reluctant to put in place mask requirements for a number of reasons, the main one being a lack of available masks.