Question to the Department for Transport:

To ask His Majesty's Government what assessment they have made of the potential health effects, including for gene expression, for passengers and crew on commercial aircraft exposed to engine oil or engine oil decomposition products.

In 2007, the independent Committee on Toxicity (COT) undertook a review of cabin air contamination, including by products such as engine oil and engine oil decomposition products. The COT concluded that the evidence available did not establish a link between cabin air contamination and ill health but made some recommendations for further research. This was further reviewed in 2013, 2022 and 2024, concluding it unlikely that the levels of chemical contaminants in the aircraft cabin air are unlikely to cause adverse health effects following acute or long-term exposures.