Mosquito coils can repel mosquitoes if used correctly. Climate and other environmental variables can impact how well mosquito coils work. Because coils emit smoke, they are used outside. Wind can waft coil smoke in shifting directions, making their protection spotty at best.

Are mosquito coils effective?

Mosquito coils are effective at deterring mosquitoes and reducing mosquito bites. However, just because they're effective doesn't mean that they're safe. Since the coils produce smoke, you should only use them outdoors or in spaces with great ventilation to prevent smoke inhalation.

Do mosquito coils kill mosquitoes?

Mosquito coils contain a mix of substances. ... Those that contain insecticides will kill (or at least “knock down”) mosquitoes, while those that contain aromatic substances (such as citronella) will repel mosquitoes or reduce the likelihood they'll bite.