Vinyl flooring poor air quality and toxicity
Most building materials will off-gas for for various reasons: 1) what their made of, 2) what they use to “glue” material in place, 3) warring of surface material. A better explanation is here:

https://www.greenbuildingsupply.com/Learning-Center/Flooring-LC/Why-we-dont-sell-luxury-vinyl-tile

What this article omits is the adhesive used to secure the material to the floor. 

Even “low VOC” material has a significant amount of material that will “off-gas”.

Government buildings now require the completed building to “run” the heating and air conditioning systems without anyone in the building for 14 days. We usually don’t do this for residential construction because there are larger quantities in governmental buildings. 

Everyone has a different tolerance towards these materials. Not much can affect me, but my son would cough and gag after a few minutes when we stayed in a hotel on vacation that recently renovated their rooms. Your tolerance may be just as weak.