Hi jladybugj,
There is more about the smell of latex in post #2 here but the latex in your mattress has been certified by Oeko-Tex for harmful substances and VOC’s so at least you have the assurance that the smell and offgassing isn’t harmful although some people can still be sensitive to it and you aren’t the only one that has mentioned the smell of one of the Ikea latex mattresses (see here).
It should dissipate over the course of a few weeks to levels that wouldn’t be noticeable or affect most people but there are also some suggestions in post #3 here that can help speed things up a little.
I would NOT put a latex mattress out in the sun because the ultraviolet light can soften and degrade the latex very quickly.
Phoenix