If you've ever felt tired, foggy, or headachy after an hour or two in the car with the button on, it might be because you've been breathing your own CO, the whole time. Yes, most modern cars donât completely seal off your car from outside air with the recirculation button, but CO2 can still accumulate according to multiple studies. The fear would be this could cause you to lose focus and get into an accident. Here's how to stay safe on long drives: âą Switch to fresh air mode every 20-30 minutes âą Crack a window, even slightly âą Avoid using recirculate for more than an hour straight âą Be extra cautious if you have multiple passengers 1. Kim, K. H., & Kabir, E. (2023). Assessment of CO exposure levels in passenger vehicles under various ventilation settings. Environmental Science and Pollution Research. https://doi.org/10.1007/s11356-023-25219-x 2. CO2Meter.com. (2015). High COz levels in your car. https://www.co2meter.com/blogs/news/23987521-high-co2-levels-in-your-car #
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