Most doctors will tell you to avoid substances that provoke allergies. But medical advice too often stops here. Real preventive health in your home means going after offensive allergens and chemicals and positively eliminating them. Air filtration traps particles and gases, leaving your air purified of offensive substances. You should be aware that the only air cleaning system accepted by the medical and scientific communities is true medical HEPA medium for particles and the combination of activated carbon and natural zeolite for gases.
Urethane is a further concern.
Curtain folds collect dust. Harbor dust, dust mites and animal dander. Carbon monoxide is the primary danger, and has a cumulative effect in the human system. Asbestos fibers reside in lung tissue and can cause lung cancer or emphysema. When good health is the issue, you demand quality.