Father-of-two Benjamin Glynn, 39, failed to wear a mask while taking the train home from work in Singapore.
A fellow commuter secretly filmed him and put the clip on social media, prompting officers to arrest him hours later.
Glynn, from Helmsley, North Yorkshire, was charged with a public nuisance offence after spending 28 hours in a cell,
The recruiter claims officers said he faces up to six months behind bars, if found guilty.
Leeds thunderstorms warning as Met Office shares latest weather forecast
Bloody machete attack on busy Leeds street left man scarred for life
York Road incident: Police appeal after pedestrian killed in crash outside Leeds Dogs Trust
Leeds Bradford Airport: Full statement on August security staff strike
Jesus Moreno: Friends looking for missing Piglove Brewing Co founder issue map of key search routes
Glynn's passport was confiscated, meaning he couldn't return to the UK as planned with his partner and two children - aged five and two.
He also lost a new job he was due to start in the UK and fears he could have to spend as much as 12 months on bail before his trial.
The Foreign, Commonwealth and Development Office, is assisting him.
Glynn said: "I had no idea anyone had even been filming, but it turned out a video of me unmasked on the late train home from work surfaced online.
"The police obviously saw it and the next day they were at the door.
“I don’t believe there is any evidence that masks protect you from Covid-19.
“Normally I would just tell people I’m exempt and it had never posed any issues before.
“But now I’m stuck here without my family and I don’t even know when I will appear in court, never mind what my sentence will be.
“All for something I don’t even believe in.”
Glynn had been working for a Singapore branch of a British recruitment company since January 2017.
Weeks before he was due to return to the UK for a new job, he was filmed without a mask near Raffles Place, the financial district of Singapore, on May 7.
In Singapore it is mandatory to wear a mask when residents leave their homes, with very few exceptions.
"I never normally wear a mask but this is the first time it has been an issue," he said.
"I had no idea anyone had even been filming until the police were at the door - I've never even seen the video because it was removed before I had chance."
Police knocked on his door on the evening of May 8 and arrested him while his family were asleep, he said.
Glynn said he was told he was being charged with being a "public nuisance", after he was spotted un-masked on a train the day before.
His arrest papers confirm the charge.
The anti-masker spent two days in a holding cell before being released the following Monday on bail.
He said officers warned him it could take 12 months for the case to come to trial, and he will face up to six months in jail if he is found guilty.
Glynn, whose family returned to Leeds on May 31, said: "This whole situation is ridiculous.
"I want to leave the country anyway - just let me go!
"I think it's insane that I am facing a trial at all, just for not wearing a mask."
He is now out of work because he was due to transfer to a position back in the UK, which has now been revoked.
"It's a horrible situation to be in when I don't know when I can next see my family," he said.
"Especially when I don't even believe masks stop the spread of the virus in the first place.
"I honestly believe it's a hoax - I don't feel there is any evidence to show mask-wearing is effective in any way.
"From a scientific basis, I think it's nonsense.
"But now all I can do is wait."
A spokesperson for the Singapore Police said: "As information related to police investigations are confidential in nature, we are unable to comment further on the case."
A spokesperson for the Foreign, Commonwealth and Development Office said: “We are assisting a British man who is awaiting trial in Singapore, and have been in contact with the local police about his case.”