It might be a good idea if transporting dry ice in a car to make sure that you are bringing in fresh air rather than setting the climate control on recirc. The reason being that as you drive, you will be converting
pounds of CO2 into a gas inside of the car. Probably not something that is going to cause you problems as long as you are aware of it and take a few proper precautions.
Just for the heck of it, I did some calculations relying on what I learned in chemistry class (that I took a hundred years ago :rofl

, you can figure that 10 pounds of dry ice (CO2) equates to 4,536 grams. Each mole of CO2 weighs 44 grams. So, that is 103 moles of gas. Each mole of gas occupies 22.4 liters (at standard temperature and pressure). So, 10 pounds of dry ice will vent about 2,300 liters of CO2 gas.
1 cubic foot includes 28.3 liters (I looked that up). So when the dry ice sublimates (if that is the right word), it will give off about 82 cubic feet of pure CO2. But according to wikipedia, at a concentration of only 1% CO2, some people will feel drowsy. So, if you mixed the 82 cubic feet of pure CO2 with air to get a 1% concentration, that would occupy 8000 cubic feet.
So, keep fresh air coming in to your car as you drive and if you stop for an hour for lunch/dinner, open the car doors for perhaps a minute or two before resuming your driving. (Or buy your meat at your destination? )
