"litter free" is correct and can be used in written English.
Example: "The city has implemented strict rules to keep the streets litter free."
Rivercare is a public volunteering programme to help keep riversides litter free and protect biodiversity.
These were "approved by the Secret Service", boasted Braden Kay, a founder of an activist group called Litter Free Inauguration, which joined with the trust to encourage people to carry out what they brought in.
Today, Rwanda is safe, corruption is minimal and streets are litter free.
"The streets are now cleaner and litter free so much of the enforcement is not needed.
"By working together, we can make a big difference". Litter Free Baildon was one of the community groups which took part in the campaign.
Image caption Litter Free Baildon said it had collected more than 1,000 bags worth of litter from the Baildon area in Bradford.
To be fair, Calgary can also boast litter-free streets.
The nation will also pledge to make 100 national monuments litter-free, including the Taj Mahal.
The march, substantial for a country of only eight million people, was peaceful and even almost litter-free.
What's more, following January's public protests about the city's refuse problem, the centre of Naples is currently reasonably litter-free.
A Disney theme park aura prevails — litter-free streets, Frank Sinatra and show tunes spilling from camouflaged speakers, signs galore.
