The poisonous gas can cause "dizziness, unconsciousness and death," a report says.
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Nantes
Protesters are angry over the death of a man who went missing after police raided a music festival.
Steve Maia Caniço, 24, disappeared when police broke up a music festival in Nantes in June.
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When police broke up a Nantes music party, 14 people fell in the River Loire and one has disappeared.
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Family and friends of Emiliano Sala say they want someone to be held accountable for his death.
Read moreThe parents of footballer Emiliano Sala talk of their pain after his plane crash death.
Emiliano Sala's father suffered a heart attack at his home in Argentina in the early hours.
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Jenny Johnson y Kayley Thomas
BBC Gales
David Ibbotson is thought to have been colour-blind, which prevents a night-flying qualification.
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Rob Phillips
BBC Sport Wales football correspondent
Cardiff City football are set to tell Fifa the deal to buy Emiliano Sala from Nantes for £15m was not legally binding.
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Jenny Johnson
BBC Wales News Focus
A series of flights around the Cardiff City striker transfer should be investigated, says aviation body.
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