Superheated gas pockets

It happens when there is a gas pocket that stays at a heat source and doesn't move for a long time for some reason. 

I think this issue is pressure related, you need to keep the air pressurized around all heat producing buildings for the heat to transfer. A small pocket of low pressure air heats up really quickly.

What do you know about heat...

Because mcg ? Its not gram thay why they heating so fast but when contact other gas / same gas they will easy cooling down

I've had this too,

the only difference was that the temperature was lower (still like 1000 C for no reason) and it was spreat a little bit. The weird part was that the surrounding area was like -4 C and suddenly there is a temperature change of 1000 degrees..

Yea it would make sense that a pocket of gas with really small mass would heat up quickly, come to think of it. On the other hand though, it shouldn't have enough thermal energy in that tiny bit of gas to make dupes melt . Also PVD, better make sure your atmosphere doesn't combust if that keeps up lol.