Hi sleepsuffering,
There are many options available when it comes to either natural, chemical free, or “safe” materials that can avoid the use of harmful chemicals in a mattress.
There is more information in post #2 here and the more detailed posts and information it links to about safe, natural, organic, “chemical free”, and “green” mattresses and mattress materials that can help you sort through some of the marketing information and terminology that you will encounter in the industry and can help you differentiate between them and answer “how safe is safe enough for me” or “how natural is natural enough for me” so you can decide on the types of materials you are most comfortable having in your mattress. These types of issues can be complex and are generally specific to each person and their individual sensitivities, circumstances, criteria, beliefs, and lifestyle choices.
The better options or possibilities I’m aware of in and around the New York City area (subject to the quality/value guidelines I linked in my last reply) are listed in post #2 here.
There are many options in the general area that would probably fit your general criteria for a “chemical free” mattress
Phoenix