IllegalPaladin on 10 February 2009
Talking about the nature of Helghan, it's cited in the opening CG to the game. While Visari is giving his speech, one of the news topics going at the bottom of the screen is,
"Helghan's atmosphere: a threat to our troops?"
If we don't see any affects of it in Killzone 2's storyline, then it's probably because it's something that slowly affects those that unprotected.
