Summarize the following:
Whether you’re shopping in a store or online, look for candles that are made with pure essential oils (not just fragrance). Also select candles that are made from beeswax or soybeans, not paraffin (a petroleum byproduct). Also check for a “lead-free” label when you purchase candles.  Look for cotton wicks when you are shopping for candles. Keep your wicks trimmed to 1⁄8 in (0.32 cm). This lessens the amount of soot the candle produces while it’s burning. This process involves hot wax, so proceed with caution. Light a tea light candle and allow the wax to melt. Extinguish the flame and then add 3-5 drops of your essential oils into the wax. Stir with a toothpick and allow the wax to cool and harden again. Experiment with the concentration of essential oil in your DIY candles until you get the result you want. Whether you are using a store-bought or homemade candle, you want to burn it long enough for the entire top layer of wax to melt. This will ensure that your candle burns evenly and will last as long as possible.  Look for candles with multiple wicks. This will help speed up the melting process, diffusing oils more quickly and efficiently. Just like with oil burners, don’t burn your candles all day long, every day as this can have negative health effects. Burn until the wax is evenly melted, then take a break. The exact times will vary based on the size of your candle.

Summary:
Buy clean-burning essential oil candles to prevent indoor air pollution. Make your own essential oil tea lights. Burn your candles long enough for it to melt all the way across.