The first production unit was introduced into a delivery suite at UHW, Cardiff mid-August and has been in regular use thereafter. Feedback from midwives was collected both informally and via questionnaire. Key takeaways:  Very positive and supportive of the project in terms of environmental benefit. Staff understand that Entonox is a greenhouse gas and that this machine reduces emissions. Many staff feel it will improve their health and wellbeing by reducing their own exposure to nitrous oxide. The machine was simple and easy to use It was quiet Although large, it was able to fit into the room ok It could be used with a mouthpiece or face mask depending on patient choice It did emit some heat, which although noticeable, didn't make the room uncomfortably hot

The ability of the N2O Clear product to eliminate nitrous oxide from an inlet stream was evaluated over 2 days at Wrexham Maelor Hospital, north Wales. Using cylinder gas, test flows simulating 1~5 LPM of nitrous oxide and Entonox were introduced into the N2O Clear unit and the exhaust concentration of nitrous oxide was measured using a G200 N2O analyser from QED Environmental Systems. % reduction in nitrous oxide between inlet and exhaust air was then calculated and determined to exceed the target 99% on all occasions.

Implementing nitrous oxide cracking technology in the labour ward to reduce occupational exposure and environmental emissions: a quality improvement study.