Often applied to enhance the atmosphere of enclosed spaces such as bathrooms or to mask unpleasant odors, scented candles and air fresheners consists of harmful materials such as limonene and phthalates.
Limonene, although harmless in its pure form and known for its lemon scent, can turn into formaldehyde, a carcinogen, when discharged the air. Formaldehyde can cause inflammatory reactions, hepatotoxicity, lung can.cer, breast can.cer, and affect pregnant women and fetuses with prolonged exposure.