[quote=“mentos046, post:5, topic:13565”][spoiler]Acid Rain used to be in the base game, and I believe it originally did actual damage while you stood in it, but I’m not sure about that part.
Eventually it was removed from the base game, but PK’s Rebalance brings it back without the damage; it just causes pain, now.
Umbrellas will sometimes protect against acid rain, but the odds are usually low enough, that it isn’t worth trying. It’s best to just stay indoors when Acid Rain occurs. Theoretically, if you had clothes that totally waterproofed you (as in you could stand in the rain with no umbrella, and not get a morale penalty for being wet), acid rain might not hurt you, but I’ve never tried that.
As for radiation, I believe that the necropolis might be radiation heavy, and I know that the Toxic Waste Dumps, and Hazardous Waste Sarcophagi are. In PK’s Rebalance, smoker zeds sometimes carry radiation, though that is very uncommon lately. Bloated zeds might have radiation, Huge Boomers definitely have radiation, and Portals and other tears in reality may sometimes produce it, but I’m not sure about that one. Artifacts may give radiation, and damaged mininukes produce a ton of it. Atomic Coffee is a very good way to get irradiated, so it must be used in small doses, which shouldn’t be a problem given how strong it is. There are plenty of radiation sources, especially with PK’s Rebalance on.[/spoiler][/quote]
More on this, if you want to really know for yourself which areas are radioactive, try finding a Film Badge and putting it on. While wearing an unwrapped Film Badge, you’ll automatically receive a message saying [glow=red,2,300]Your Film Badge turns Yellow/Red/Black[/glow] when you step into a radioactive area. Understandably, black means you’re pretty much already dead, because that’s the indicator for a fatal dose. Have fun desperately trying not to die while your health rapidly depletes over time, and you go to sleep only to never wake up.
By the way, Clean Suits aren’t perfect protection, and neither is Light Power Armour. Both of them stop protecting you once the radiation gets high enough. To go into a Sarcophagus you require a full NBC Suit or Heavy Power Armour. Of course the contents of those vaults mean you have other things to worry about if you don’t already have HPA…