Legal action is being taken against a number of UK airlines on behalf of 61 cabin crew after they were exposed to "toxic cabin air" while working onboard aircraft.
Unite said concern has been mounting over "fume events" and exposure to contaminated cabin air, with the number of legal cases being pursued by the union increasing from 17 in recent months. Unite is also calling for an independent inquiry into the issue.
Howard Beckett, the union's executive director for legal affairs said: "The issue of toxic cabin air is so serious that our cabin crew members are likening it to the impact of asbestos in the building industry.
"Increasing numbers of our members have come forward, seeking help and advice since we set up our toxic air helpline a few months ago. Some have been involved in one-off 'fume events' while others fear they have suffered long-term exposure to contaminated cabin air.
"This is a health issue which the airline industry has been aware of for some time and one which they need to address as a matter of urgency."