You can set different lights to have or not have the volumetric effect by ticking/unticking “affect translucent lighting” on the individual lights. As for the individual lights controlling individual settings like dust/fog/density etc, right now the way the system works, everything is built with global settings from a central blueprint actor you bring into your level, it doesn’t add any extra parameters to the engine-default light actors. You could theoretically use trigger volumes to have more granularity as you’ve described, but this probably won’t be a built in feature.