A distance of 300 miles and the normal trade winds usually prevent Hawaii's Kilauea volcanic gases from reaching Kauai. But there are instances when the wind patterns shift to what we call a "Kona Wind" which can bring the gases (VOG) to the other islands along with unsettled weather. Kauai had both yesterday, "voggy" skies with torrential winds, rain, & flooding. With no industry on the island, our skies are normally crystal clear. That is not the case where the mountains are shrouded in VOG as seen in the pictures below.
The good news for those of us on Kauai is that while VOG is the norm on the Big Island, it's rare here. It only occurs a few times a year and lasts only a few days.
Pictures were taken from the community of Pikake. It's a wildly popular new community in Lihue with numerous homes under construction and many homesites still available.