mn: we have just discussed this issue with outgassing here and ways to deal with it:
https://forum.mattressunderground.com/t/outgassing
Maybe that can help with your current mattress.
I think Sleep EZ offers great quality/value among natural latex mattresses.(unless someone sensitive to latex)
My Green Mattress and Berkeley Ergonomics(that I just got) are other excellent natural mattress options but not sure if they ship to Canada…