This is the flooring I chose because Andy Pace of Green Design Center, Waukesha, WI has tested it for off gassing and it is 100% free of formaldehyde off gassing. He is the first person in the USA to have the FRAT device (formaldehyde attenuation release test) with which he can test any surface or product for release of formaldehyde. of
course there are THOUSANDS of other HAPs - hazardous air pollutants besides formaldehyde, but he can't test everything, and formaldehyde is usually a good indicator or other gasses that will be present too.
the product is mostly limestone, and then a hard vinyl top....which is safe. i would have purchased the wool carpeting sold by Green Design Center, but my room was too small to meet the min. order amount. so i went with this:
https://www.thegreendesigncenter.com/product/cali-vinyl-pro-lvp-flooring/