Ask Dr. Ed

This was a letter printed in Car & Driver (May)

Q: Is it true that you shouldnt use the air-recirculate button on
your cars climate control for more than a minute or so? A friend
told me that you could die from lack of oxygen if you do.

Editor: Not true. In fact, when the windows are closed recirculating the
air is safer than running the fresh-air fan for extended periods–
which can cause the cabin to explode.

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