FIFA made false claims about last year's World Cup in Qatar being carbon neutral, an advertising regulator in Switzerland said Wednesday.

FIFA was "not able to provide proof that the claims were accurate," the federally recognized Swiss Commission for Fairness said in its judgment into complaints filed from five countries.

The commission said it "advised FIFA to refrain from making unsubstantiated claims in the future. Particularly the claim that the 2022 FIFA World Cup in Qatar was climate- or carbon-neutral."

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Official World Cup countdown clock

People gather around the official countdown clock showing remaining time until the kick-off of the World Cup 2022, in Doha, Qatar, Thursday, Nov. 25, 2021. Fans going to the World Cup in Qatar must show a negative COVID-19 test when they arrive as part of the host nation’s rules to combat COVID-19, organizers said Thursday, Sept. 29, 2022.  (AP Photo/Darko Bandic, File)

FIFA said in a statement it would analyze the recommendations and had the right of appeal. The ruling is not legally binding.

Qatar spent more than $200 billion on a decade-long construction program of mostly air-conditioned projects to prepare for hosting the soccer tournament in the gas-rich emirate. It relied on using hundreds of thousands of migrant laborers working in widely criticized conditions.

Seven of the eight stadiums used — including one with a facade of shipping containers later to be dismantled — were built in and around Doha. A new city, Lusail, was constructed, including the stadium that staged the World Cup final.

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FIFA World Cup Qatar stadium

General view of the pitch at Lusail Stadium ahead of the FIFA World Cup Qatar 2022 on Nov. 18, 2022, in Lusail, Qatar. (Sarah Stier - FIFA/FIFA via Getty Images)

Environmental groups in Belgium, Britain, France, the Netherlands and Switzerland filed complaints about FIFA’s claims of a carbon-neutral tournament to the Swiss advertising regulator.

The Swiss commission in FIFA's home city of Zurich evaluated claims that 3.63 million metric tons of carbon dioxide had been compensated for and all tournament-related emissions would eventually be offset.

FIFA had not proven the offsets "and did not set out a plan to define how it will further offset emissions," the ruling said.

"It was unclear to the (regulator) whether the promised level of (carbon dioxide) compensation was realistic at all," it said.

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Photo taken on Aug. 11, 2022 shows the interior view of Lusail Stadium which will host the 2022 FIFA World Cup matches in Doha, Qatar. 

Photo taken on Aug. 11, 2022 shows the interior view of Lusail Stadium which will host the 2022 FIFA World Cup matches in Doha, Qatar.  (Nikku/Xinhua via Getty Images)

FIFA acknowledged in a statement that "climate change is one of the most pressing challenges of our time."

"FIFA is also fully aware of the impacts that mega-events have on the economy, the natural environment and on people and communities, and has been making substantial efforts to tackle those impacts and, at the same time, to use opportunities to maximize the positive effects of its most iconic tournament," the soccer body said.

The 2026 World Cup will be staged in 16 cities in the United States, Canada and Mexico with 48 teams instead of 32. They will play 104 games instead of 64, though in stadiums already existing.