When we breathe we give off carbon dioxide and octenol. It also oozes from our skin. This is what is so attractive to those pesky mosquitoes. They can smell is for dozens of feet. Citronella candles have been popularized as mosquito repellent, and they do provide some protection. But so do ordinary candles. It turns out that, though not quite as effective as citronella, any burning candles will keep some mosquitoes at bay. But you must be near the smoke of the candle to get any benefit. This is true as well for the citronella candles.
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