Is a plate of mosquito coil harmful to humans?

A properly used mosquito coil generally does not pose harm to human health, but long-term improper use may lead to adverse symptoms.

The active ingredients in mosquito coils are various pyrethroid insecticides. When burned, the resulting smoke paralyzes mosquitoes' nervous systems, effectively killing them. The levels of harmful substances are low and inherently have relatively low toxicity. As long as correct usage methods are followed and certified, quality mosquito coils are used, they should not pose a health risk. However, improper use—especially short-term inhalation of the smoke—may trigger respiratory conditions such as asthma, while long-term exposure could potentially increase the risk of diseases like cancer.

When using mosquito coils, ensure windows are open to allow ventilation, especially in small or confined spaces. Since the smoke produced by burning mosquito coils can irritate the respiratory tract, it is advisable to minimize their use in households with infants, young children, pregnant women, asthma sufferers, or elderly individuals. Always place mosquito coils away from flammable materials.