Is it safe to use mosquito coils during pregnancy?
Using mosquito coils during pregnancy is generally not recommended due to potential health risks to both the pregnant individual and the developing fetus. Mosquito coils typically contain pyrethroid insecticides (such as allethrin or d-phenothrin) and combustible fillers, and when burned, they release fine particulate matter (PM2.5), polycyclic aromatic hydrocarbons (PAHs), formaldehyde, benzene, and other volatile organic compounds (VOCs). These combustion byproducts are known respiratory irritants and have been associated with adverse perinatal outcomes in epidemiological studies—including increased risk of low birth weight, preterm birth, and developmental delays—particularly with prolonged or poorly ventilated indoor exposure.
While occasional, brief use in a well-ventilated outdoor or open-air setting may pose minimal acute risk, routine or indoor use—especially in enclosed bedrooms or living spaces—is discouraged. Pregnant individuals are more susceptible to airway irritation and oxidative stress, and fetal lungs and nervous systems remain highly vulnerable to environmental toxicants throughout gestation. Safer alternatives include physical barriers (e.g., intact window screens, bed nets treated with long-lasting insecticidal netting [LLIN]), spatial repellents approved by the WHO (e.g., metofluthrin-based passive emanators), and topical repellents containing DEET (up to 30%), picaridin, or IR3535—each of which has been deemed safe for use during pregnancy when applied according to label instructions.
If mosquito control is urgently needed indoors, consider using an electric mosquito repellent device with a non-pyrethroid active ingredient (e.g., lemon eucalyptus oil-based formulations, though efficacy varies) or consult a healthcare provider or environmental health specialist for evidence-based, pregnancy-appropriate recommendations tailored to your local vector ecology and housing conditions.