Though they seem safe, regular scented candles that use synthetic fragrances and paraffin wax can be a big source of indoor air pollution.
The health issues related to paraffin and synthetic fragrances have been well researched.
‘The majority of candles sold in the UK are made from paraffin wax, a by-product of the petroleum industry. These have been shown to release an alarming range of volatile organic compounds (VOCs), substances that can be problematic to health. Unless your candle is clearly made of 100% soy, rapeseed or some other natural wax it will be paraffin.
When researchers burnt a range of candles in a laboratory for a study the chemicals released in harmful amounts included human carcinogens and chemicals known to cause asthma attacks, such as toluene and benzene.”
Fortunately, there are some great alternatives to scented candles, soy wax and essential oils being one of them.