Sandalwood mosquito incense is a common mosquito repellent products, due to its good mosquito repellent effect and long-lasting fragrance, it is widely used. However, long-term use of sandalwood mosquito incense may cause some harm to human health. First of all, the main ingredients in sandalwood mosquito coils are sandalwood oil and fumigation powder, which produce smoke and harmful gases such as benzene, toluene and dioxin when burned. Prolonged exposure to these harmful gases may lead to headaches, dizziness, breathing difficulties and allergies and other uncomfortable symptoms. Secondly, the smoke produced by burning sandalwood mosquito coils contains particulate matter, especially fine particulate matter (PM2.5), which can enter the respiratory tract and be deposited in the lungs, causing potential damage to the respiratory system. Long-term inhalation of particulate matter can lead to respiratory diseases, cardiovascular problems and an increased risk of lung cancer. In addition, sandalwood mosquito coils contain volatile organic compounds (VOCs) such as formaldehyde and benzene. These compounds volatilize in indoor air and pose a potential threat to human health. Prolonged exposure to these compounds can cause eye irritation, skin sensitization, respiratory problems, and potential cancer risks. Overall, the long-term use of sandalwood mosquito coils is hazardous to human health, mainly in the form of inhalation of harmful gases and particulate matter, which may lead to respiratory diseases, cardiovascular problems and an increased risk of lung cancer.