I have bought Tigerino clay litters for over 10 years.
Recently the litter has become very dusty, so dusty I have to keep the lids open 24/7 and when I clean up then there is dust all around the litter tray and me trying not to breathe it in(imagine what the cats feel when they use the toilet and it would have a lid on).
First I noticed it on a Vanilla scented version, thought that maybe it was a bad batch. Next time ordered Lemongrass and then Sensitive. All of them had the same problem!