3 ms·

I've done it tons of times. Part of having the stuff wrapped up and insulated is that it isn't sublimating like mad.

• bjoli 6y ago
  You don't really notice 1000ppm, and unless you have some ventilation going you can probably reach that quite quickly in your car. I am not saying that it didn't work out or that it was reckless. Just make sure you have adequate ventilation.
  • at_a_remove 6y ago
    Just as an indicator, you can get up to 5,000 ppm with two passengers in a car after an hour's worth of driving.
    • bjoli 6y ago
      Exactly: 5000ppm means significantly worse decision making and crisis response. How much more co2 does sublimating dry ice put out? Well packaged probably not that much, but certainly more than another person breathing beside you.