It sounds like dust or scents in regular litter could be causing those reactions. I came across a useful article on hypoallergenic cat litter here https://pacoandpepper.shop/blog/hypoallergenic-cat-litter which has some good tips on selecting low-dust, hypoallergenic options. Their olive pit litter is natural and seems to work well for cats with sensitivities.
It sounds like dust or scents in regular litter could be causing those reactions. I came across a useful article on hypoallergenic cat litter here https://pacoandpepper.shop/blog/hypoallergenic-cat-litter which has some good tips on selecting low-dust, hypoallergenic options. Their olive pit litter is natural and seems to work well for cats with sensitivities.