Vehicle Air Quality
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We Used Recirculation to Avoid a Truck Odor—Then Cabin CO₂ Rose to 1,573 ppm
We temporarily switched to recirculation while passing a strong-smelling truck. After we forgot to switch back, cabin CO₂ rose to about 1,573 ppm, then…
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Does Fan Speed Affect Car CO₂ in Fresh-Air Mode? Our 4-Person Test
Our team tested four people in the same car with fresh-air ventilation. At fan level 1, CO₂ rose from about 524 to 866 ppm…
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How Different Is CO₂ Inside and Outside a Car? Our Real 1,500 vs 450 ppm Test
Our team measured about 1,500 ppm CO₂ inside a car and about 450 ppm in the outside air beside the same vehicle, a difference…
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Does Recirculation Save EV Energy? What We Measured on the Same 20.8 km Route
We drove the same 20.8 km EV route twice with the HVAC at 28°C and fan level 5. The vehicle displayed 11.3 kWh/100 km…
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Does Singing Make Car CO₂ Rise Faster? What We Observed in Our 3-Person Recirculation Test
We tested three people singing inside a car with recirculation on. Cabin CO₂ rose from about 455 ppm to 1,406 ppm, but the result…
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How Fast Did CO₂ Rise With Five People in Our Car? Our Recirculation Test
Our team measured cabin CO₂ with five people in a car and recirculation on. Starting near 558 ppm, the reading passed 1,500 ppm in…
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When Should I Switch From Recirculation to Fresh Air? What I Learned From My Own Car CO₂ Test
I tested my car’s recirculation and fresh-air modes while watching cabin CO₂ in real time. The results changed how I personally use the ventilation…
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Does Tesla Model 3 Automatically Switch to Fresh Air as CO₂ Rises? A Real Driving Test
Tesla Model 3 climate control can use either outside air or recirculate air already inside the cabin. But what happens when cabin CO₂ keeps…
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Where Does Fresh Air Enter a Car? A Real HVAC Intake Demonstration
Where does outside air actually enter a car? We used paper strips on a real vehicle to show the difference between recirculation and fresh-air…