Thanks Mel1 - good to know I’m not the only one. I did some googling and found others who claim it’s the glue used in the filter. But, like you, I’m totally surprised this issue isn’t reported more often. When I asked Dyson they said it was the first they heard of it. Maybe it’s being down played or people just don’t notice the smell. I live in British Columbia so maybe humidity is a factor - tho the smell from the machine was emitted almost straight away. When I changed the filter it started 10 minutes after. It concerns me because my newborn was exposed to it for a week while I tried to figure out what was going on. Anyhow, buyer beware!