The article discusses the importance of carefully selecting candles for indoor air pollution and health consequences. Modern candles are often made from petroleum waste byproduct paraffin, a petroleum waste product, for cost-effectiveness, color retention and fragrance output. However, these products can pose health risks due to their highly refined or food-grade paraffins, which meet strict Food and Drug Administration standards. Paraffin's soot production is reportedly greater than that of soy or beeswax, but this is seen as a compromise. Phthalates are chemical additives that stabilize scent and extend fragrance but can release toxins into the air when candles are burned. While scented candles can still pose health concerns, synthetic oils can release VOCs and other toxic chemicals. The article also notes that it may be difficult to identify what ingredients are used in candles, as they may be listed as fragrance or parfum, allowing manufacturers to obscure synthetic additives.