Beeswax, soy, or "all other" candles? My guy often starts to complain about scent causing allergies, asthma, headaches, or general annoyance when he comes within a five foot proximity of a lit candle. His sensitivity is correct.
Unscented beeswax it is. *100% beeswax actually cleans the air by releasing negative ions while burning. Pollen, dust, pollutants, and dirt in the air carry positive charged ions. The negative ions released from burning beeswax negate the positive charge of air contaminants, and neutralized ions are sucked back into the burning candle or fall to the ground. Thus effectively reducing asthma, allergies, and hay fever by drawing the pollutants out of the air. Sadly most soy candles on the market aren't pure soy as marketed. They usually contain some form of paraffin or scent that releases harmful toxins. Even essential oil scented candles, in beeswax or soy alike, are not ideal since combustion changes the molecular structure of their oil--releasing toxins as well. 100% pure beeswax is required to achieve such benefits for pure only requires a product to contain 51% of a certain ingredient.
If you're looking for an old-school holistic way to purifying your air while creating ambiance, I suggest 100% beeswax.