Nitrogen and oxygen in their gaseous stage are considered as insulator as they are not able to pass electricity through them. Electricity can be conducted through a medium when electrons move.
Hence, when both nitrogen and oxygen are in plasma state they conduct electricity. A plasma state of a gas is the state in which it exists in ionized state where electrons are able to move freely.
The phenomenon is called an equinox. More specifically when it is September it is called the autumnal equinox ,and when it is March it is called the vernal equinox. Hope this helped!
