Level 1: Composition of mosquito repellent incense and its harm to pregnant women Mosquito incense is a common mosquito repellent product. Its main ingredients are chloroacrylic acid, propofol, rosin, etc. These ingredients will produce toxic gases such as benzene and toluene when burned. , xylene, etc. These toxic gases are potentially harmful to pregnant women and fetuses, and may lead to miscarriage, premature birth, fetal malformations and other problems. Level 2: The use of mosquito coils may cause asthma and allergic reactions. The use of mosquito coils may also cause asthma and allergic reactions. Because the chemicals contained in mosquito coils can irritate the human respiratory tract and skin, causing