EMICODE Accepted by GBCI?

Omer, I assume you can convert ug/m3 limts to g/L as used for LEED? If so, then this is no problem. For this credit you simply need to document that your products comply with the limits—you don't need a U.S.-specific certification.

I wonder how I convert μg/m2h which is the most common limit for VOC measurements in Europe to g / l.

There is no conversion from μg/m2h to g/L -- those are different measurements. The units are not compatible. You need to start with μg/m3, then convert to g/L. I like onlineconversion.com, though you may have to do separate conversions for μg to g and m3 to L.

EMICODE goes for testing of emissions from applied adhesive into indoor air and gives results as emission factor (µg/m2h) or as air concentration in a model room (µg/m3).
US VOC limits for adhesives go for testing of VOC content in a can of non-used liquid adhesive and gives results as g/l.
There is no correlation between both - except if there is absolutely zero VOC content, nothing can be emitted.
You could try to apply for an ID credit 10.1 with an EMICODE adhesive, I assume.
But - any EMICODE licensed adhesive has less than 0,5% solvent content which is similar to (but not 100% identical with) 5 g/l VOC.