Confused
Car Insurance
From video: I pressed the recirc button and closed the windows to see what would happen. Alarming CO2 level!
Published: March 16, 2026
Video Description
I tested how much carbon dioxide levels would rise in a car with the ventilation system set to recirculation mode and the windows closed over a long journey.
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This video is a guide intended to help people who are learning to drive with a driving instructor in Great Britain, it is by no means a replacement for driving lessons with an appropriately qualified driving instructor.
Laws and driving rules may be different in your country. The makers of this video cannot be held liable for any consequences caused by any information that is in any way inaccurate, misleading or missing. The makers of this video are not liable for any person's driving other than their own, it is the responsibility of the person driving a vehicle to ensure they drive safely and within the law. The makers of this video are also not liable for any person failing a driving test as a result of the information provided in the video.
00:00 The test
00:48 Recirculation on
06:26 Recirculation off
11:41 Conclusion