As agreed in discord discussions, I have tidied up your article and raised your score.
What you have done is a good first step, but you still need to go further.
The biggest issue is that 994 is still way too obscenely powerful. Terajoules is the measurement range of gigantic city-destroying bombs, and the atomic bomb over Hiroshima had a yield of 63TJ. For reference in the incident report that you forgot to change and which I did for you, you wrote that 994 made the agent go off to the tune of 96TJ. It's a wonder that place didn't become a 17.37km-wide smoking crater, and only 2 personnel died and the rest were just injured.
For a point of reference we will have to convert from joules to Tonnes of TNT.
4.184 TJ is equivalent to 1 kiloton of TNT. That's 907184.7kg of dynamite. Can you imagine stacking up enough TNT to weigh that much, let alone the explosive force of igniting that large a pile of dynamite?
I propose a direct conversion of explosive force based on the weight of the object into weight in TNT. So a 65kg human becomes equivalent of 65kg of dynamite (4.184x106J x 65 = 271.96MJ).
The gains of this little lung protecting flammable gas is very little compared to the sheer destructive power of 994, especially when there are countless methods of cutting-edge gas masks, air filtration systems and isolated air suits that don't require a nuclear-bomb-level bird to explode things.
Of course it's still interesting to consider that 994 was behind Tunguska. The issue is we don't know HOW it managed to pull that off, and we don't want it to do it again, ever.
It's good that you removed several digits of TJs from the power scale, but I think TJ still needs to be tapered down to GJ and MJ.
I will raise my score to 4 once the appropriate changes have been made. Remember that I'm pushing you to do all this because I'm interested in seeing your article succeed.