Sixteen out of Wales' 22 councils have now banned the use of sky lanterns on their land.
After discussions with RSPCA Cymru, Torfaen County Borough Council has become the latest to ban lanterns that can kill or harm animals.
The councils yet to impose a ban are Flintshire, Wrexham, Anglesey, Newport, Merthyr Tydfil and Swansea.
'Fantastic news'
Paul Smith, RSPCA Cymru’s public affairs manager, said: "It’s fantastic news that Torfaen council has become the latest local authority to ban sky lanterns, and RSPCA Cymru was pleased to work closely with them to help achieve this.
"An outright ban on sky lanterns, which can cause injury, suffering, and death to animals, remains our primary objective. We’d love to see the Welsh Government bringing forward proposals to achieve that in Wales."
The leader of Torfaen council, councillor Anthony Hunt, said: "For some time we have recognised the dangers associated with the use of sky lanterns.
"We have responded to the growing expectation for local authorities to ban the release of sky lanterns and massed balloons from council owned land and have asked our school governing bodies to adopt this policy."
Livestock risk
The RSPCA said over 200,000 sky lanterns (also known as Chinese lanterns) are sold in the UK each year. They can be eaten by animals or cause entanglement or entrapment which can have fatal consequences.
The Farmers’ Union of Wales has also urged the public to remember the distress fireworks and sky lanterns can cause to livestock.
"We further urge people not to use sky lanterns, which have been banned by [a lot of councils] in Wales, as they pose significant dangers to livestock and are, of course, a considerable fire safety risk,” added Mr Griffiths.
