The doctor could provide the name of several products their patient had problems from. This would narrow the problem substances to the chemicals that the products had in common. A record could be kept documenting which products and specific chemicals seemed to be causing problems. Then industry can replace these specific chemicals with safer ones. And companies whose products were frequently cited as causing problems would know that changes needed to be made.
Industry needs to start testing common combinations of materials.
This would shed light on the synergistic potential of the materials. Testing needs to be done on the respiratory affects of fragrance chemicals. This includes effects on both upper and lower breathing passages. Testing needs to be done on the neurological affects of fragrance chemicals. The industry should recommend and encourage that fragrance formulation in products designed to be used around and for children and infants should be extensively tested for safety via all routes of exposure.