I have chemical sensitivities, to the point where I can't be around people who wear perfume, can't go into homes filled with scented candles (even if they aren't burning), and can't walk down the detergent or cleaner aisle at the grocery store without having a very strong reaction and needing my asthma puffer.
If you are trying to rid your home of chemicals, stay away from candles not made of beeswax or soy wax, and don't buy scented candles unless you are certain they contain essential oils rather than petroleum derived scents.
Grow scented flowers in your garden and bring in fresh flowers often--but don't buy flowers, most are heavily sprayed with all sorts of chemicals.
Diffuse essential oils as
so lucky has indicated. But don't buy the "plug-in" or commercial "oil infuser" air fresheners--they are all petrochemically derived and some even contain formaldehyde. (My friend's husband used to work in the industry and was just horrified to real the "materials data safety sheets" on some of the stuff they use, which is considered "safe" in the amounts that are used in the products.)
The best way to have a fresh smelling home is to clean regularly with non-toxic cleaners, to damp-rag dust often, and to open windows to let in fresh air in/stale air out.
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