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A comment on Nearly all UK drivers say headlights are too bright. Parent comment

Re:Nearly all UK drivers say headlights are too bright by gblargg on Wednesday November 19, 2025 @12:50AM (#45976280)
> One can measure CO₂ as a proxy to rebreathed air fraction.

On this topic, I got a CO₂ meter fairly recently and was shocked how quickly it spikes with a couple of people in a car with the windows up and on recirculate. Easily over 2000 after a few minutes. I have to remind myself regularly when it's really hot or cold outside to keep the vent setting on fresh air.

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Re:Nearly all UK drivers say headlights are too bright by xattt on Wednesday November 19, 2025 @03:14AM (#45977042)
I’d love for cars to get some sort of sniffer that will switch to recirc if it detects a spike in exhaust fumes.
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Re:Nearly all UK drivers say headlights are too bright by FireBeyond on Wednesday November 19, 2025 @02:57PM (#45984303)
I had a Jaguar that had an air quality sensor that would switch to recirc based on particulates and then back to fresh air when the threshold indicated.
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