Airline pilots are secretly donning oxygen masks and ­issuing emergency warnings because of poisonous fumes seeping into passenger jets.

Potentially deadly incidents are being reported at the rate of at least one a week.

An official dossier reveals one captain collapsing and pilots feeling dizzy and vomiting.

At least 270 incidents have been reported to the Civil ­Aviation Authority since 2006, but campaigners claim the true ­figure could be 200 times higher because many pilots are too afraid to submit reports.

Air crew are regularly taken to hospital for post-flight checks, the CAA reports show.

Unknown to most passengers, toxic fumes, which leak into the plane’s air systems, frequently become so severe that crew have to wear oxygen masks.

The build-up of toxins in their bodies from constantly flying puts air crew at particular risk.

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