/
This is a mod meant mostly for modpack makers so they can add a challenge to their world. You can make the rain deadly. Or the sunlight. Or you can have areas in the world that are polluted. This mod is extremely configurable:
Here is an image of the radiation monitor while standing close to a weak radiation source:
!Radiation Monitor
This mod can be used in any modpack without restriction.

Adding bad effects to rain, sunlight or local areas in the world