@drjoe_md: 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 don’t 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: • Switch to fresh air mode every 20-30 minutes • Crack a window, even slightly • Avoid using recirculate for more than an hour straight • 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 ##cartips##roadtripping##medicalfacts##healthtips

Dr. Joe, M.D. 🩺
Dr. Joe, M.D. 🩺
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Friday 06 June 2025 15:55:52 GMT
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mr.needham23
Mr.Needham23🇦🇺🇺🇸 :
As a mechanic this is entirely false. All air vents to the atmosphere even when on recirculating, the systems are designed to constantly bring fresh air on and off and are constantly being controlled by A/C computer systems, If you knew anything about a/c control systems you would know this.
2025-06-07 22:13:11
179
markca2020
Mark :
I don’t think it seals up the car as well as you think
2025-06-06 17:48:26
372
jeannie8461
Jean Boring Speer :
Thanks! I usually only turn it on if a car or truck with horrible exhaust is in front of me, but I’ll be more aware now for sure!
2025-06-09 02:29:33
0
castingkaz
Casting Kaz :
Wait I thought that was air inside the car ?! I leave it on the entire time the air is on
2025-06-10 03:36:35
0
jayflrz
J. :
Yeah bro this isn’t how that how works 💔
2025-06-06 17:22:30
117
katedwards65
katedwards65 :
I’d rather breathe my own air than all the toxins and exhaust and chemicals on the highway
2025-06-10 17:38:30
0
enchantedblooms7
EnchantedBlooms7 :
If I don’t turn that on, all I can smell is the exhaust from the other cars. What do you do in that case?
2025-06-07 05:21:03
5
koreywright7
Korey Wright :
Lol these people come up with anything😂😂😂
2025-06-09 13:00:13
0
jdccat035
jdccat035 :
Like a tupperware full of farts?!?!?! 😳🤣
2025-06-06 21:33:14
0
katupurass
Katupurass :
Don't masks do this a well? Been meaning to ask u for a long time now. Also, aren't asthmatic ppl not advised to wear masks as they cause resp distress. I have asthma & I get asthma attacks every time I put one on.
2025-06-08 23:02:55
0
brosgrims
brosgrims :
Hmmm…what happens to people that sleep in cars overnight with the car off and the windows up?
2025-06-06 22:25:09
15
trystan_fraser
TrystanFraser :
If your interior was sealed so tight that recirculating the air makes you feel that way. Then if you close the door with the windows up the windows would explode
2025-06-08 08:11:53
1
sporty_nerd89
sporty_nerd89 :
Most modern vehicles still allow small amounts of fresh air in and there are vents in back behind the bumper. But I guess if you have a pack car this could happen.
2025-06-14 20:06:19
0
j.p.visuals
Jin :
It takes about 40 minutes to get to 4000ppm from a person exhaling in a car with recirculating. 5000ppm shows symptoms. 40,000 is danger. I pulled up a paper to confirm what the doc is saying
2025-06-07 21:29:57
1
bout.that.lyfe
Bout.that.lyfe :
I just wear a
2025-06-08 22:54:06
0
user55688510
Twinkie :
Thank you for the info
2025-06-06 16:02:40
3
miss.haylee.jade
Jade | Thrift • Crafts • Chaos :
But that that’s only button that stops my Jeep from making a ticking sounds from behind the dash. It’s annoying, so I’ll take my chances. 🤣
2025-06-09 05:49:02
0
alcalinouwu
AlcalinoUwU :
when I'm driving through a city, the outside air is like 99% smoke from the other cars, recirculating will kill me in an hour, not recirculating will kill me Immediately
2025-06-06 16:09:19
37
mike._.west
Mike :
That actually filters the air through an in cabin air filter. The filter is usually behind the glovebox. Next time when the service write asked if you want to change it. I would recommend that you do.
2025-06-06 19:41:42
2
elcharlie333
El Charlie :
Wym no new air comes in? What about the AC? 🤨
2025-06-07 22:58:44
1
fargingicehole
fargingicehole :
I can't have the outside air coming inside. the smells are too intense and diesel causes me to have shortness of breath. can't be around diesel for some reason.
2025-06-11 00:36:45
0
karenlynn77
Karen Gassman :
What!?!? I never knew this!
2025-06-07 21:17:47
0
tiffanypriorereed
TIFFANY PRIORE :
This is prob why I’m trying not to fall asleep every time I have a long distance drive. Seriously it’s bad I have to force myself to stay awake
2025-06-14 04:50:09
0
athenaemerald1122
AthenaEmerald1122 :
That’s a stretch, your car is not sealed that tight. And most of us get out to stretch legs, eat or use the bathroom.
2025-06-06 16:53:57
41
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