Nova Gas

For the neurotoxin of a similar name, see Nova-6

"Start with two gas grenades that impair movement, blur vision and cause damage over time."

- Description of Nova Gas in Create a Class 2.0

Nova Gas is a Tactical Grenade that is featured in ''Call of Duty: Black Ops. ''

Overview
The Nova Gas acts similarly to Tabun Gas or Stun Grenade, albeit with a damaging effect. Players receive thirteen damage per second spent in the gas, and it takes eight "Hits" with the gas for a player with 100% health to die.

Players with Tactical Mask equipped will not be affected by Nova Gas.

Trivia

 * "Nova Gas" is also the name of a chain of fuel stations in Modern Warfare 2, as seen on the multiplayer map Salvage.
 * The pre-release description of the grenade states that the player would begin with two gas grenades; the retail version only allows one, and the description was changed to match. This was probably added to stop the from being "spammed".
 * This particular form of Nova 6 (if it is indeed the substance) appears to be the version the Nazis had in development, characterized by its slow kill time in comparison to the gas you encounter in the single player campaign mission "Numbers". Either that, or it's lethality was severely reduced for multiplayer balancing purposes.