Background: Nitrous oxide (N20) is a greenhouse gas with a global warming potential of 280 times that of carbon dioxide. This project aims to identify potential nitrous leak and reduce the waste of N20 in Glangwili Hospital, a small district general hospital in South Wales. 
 
 
 Methods: British Oxygen Company (BOC) supplied us with data on how much N20 was supplied to, and returned from, the hospital between 2021-2022. Data was collected from the anaesthetic machines over a period of three months, looking at the consumption of N20. A leak test of the piped nitrous system was performed during which no nitrous was used. Lastly, anaesthetists were surveyed on their practice with regards to N20. 
 
 
 Results: On average, Glangwili purchased 54,000L of N20 per month and consumed 2109L, a usage of 3.9%. The leak test identified a leak of 1.3L/min. From the survey of local anaesthetists, 80% of respondents state they use N20 only four times a year or less. 
 
 
 Conclusion: This project has identified that 96% of the N20 purchased does not reach the patient. These findings are consistent with results from Cardiff and Vale University
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