vehicle ventilation
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Does Car A/C or Heat Add CO₂ to the Cabin? A Real No-Occupant Test
Does running a gasoline car’s air conditioner or heater add CO₂ to the cabin? In our real no-occupant test, EVO-CO2V measured 420 ppm after…
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Fresh-Air Mode vs Open Windows: Which Lowers Car CO₂ Faster? A Real Test
Which lowers high car cabin CO₂ faster: fresh-air HVAC or opening the windows? In our real EVO-CO2V test, both methods reduced CO₂ from above…
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How Fast Does CO₂ Drop in a Parked Car After Everyone Gets Out? A Real Test
How quickly does elevated CO₂ disappear after everyone gets out of a parked car? In our real-world EVO-CO2V test, cabin CO₂ fell from 3,344…
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Does Lexus AUTO Air Intake Switch to Fresh Air at High CO₂? Our Real Test
Many vehicles offer an automatic air-intake mode that can switch between recirculated cabin air and outside air. But what happens when cabin CO₂ becomes…
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Does Automatic Car Climate Control Switch to Fresh Air When CO₂ Rises? Our Real Test
Our team monitored cabin CO₂ while the vehicle climate system was operating in automatic mode. During the recorded sequence, CO₂ rose from about 2,980…
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Can a Parking Air Conditioner Keep Cabin Air Fresh? Our Real CO₂ Test
A parking air conditioner can make a parked vehicle much more comfortable in hot weather. But cooling the cabin raises another question: Does a…
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Is Cracking Car Windows Enough to Control CO₂ While Parked? Our Real Test
Our team tested cabin CO₂ while sitting in a parked car with two windows slightly open and a parking air conditioner running. After an…
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Can Wearing Masks Reduce CO₂ Buildup in a Car? Our Real Test
Our team tested two people wearing masks inside a car to see whether masks would reduce cabin CO₂ buildup. During the real-world test, CO₂…
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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…