Other than pure wool, jute, hemp cotton and natural rubber there are no ingredients. Styrene is a known toxin and suspected carcinogen. 4-PC has not been proven toxic by industry research. It sure hurts many that breathe it but research often goes the way that determined by industry and not by consumers who are injured. Fumes and odors associated with new carpets cause headaches, runny eyes and nose.
Odors persist for months and years as do fatigue and malaise from newly renovated homes and offices.
Tests where done to appease the public. You can imagine the results. Vinyl-backed carpet tiles were tested. They emitted a distinct chemical odor, such as vinyl acetate and formaldehyde. CPSC study did not find any negative health could result from this.