Mosquitoes are one of the reasons for hating summer! After nightfall, this miniature bomber will not stop for a moment-circling around, waiting for a chance to hunt for blood. Fighting mosquitoes has become a daily compulsory course-slap, light mosquito-repellent incense, apply toilet water or prevent mosquito bites and repellent mosquito bites… but how effective are they? Poisonous mosquito-repellent incense? [A plate of mosquito-repellent incense releases the same harmful substances as 100 cigarettes, mosquito-repellent incense can cause leukemia, mosquito-repellent incense contains DDT…] As long as you surf the Internet, you can always find such news. Is this really the case? Most mosquito-repellent incense on the market, Its active ingredient is (pseudo) pyrethroid insecticide. As early as the 16th century, Persians discovered that pyrethrum flowers have insecticidal effect, Later, people extracted pyrethrin from it. This is an insecticide with fast knockdown, strong insecticidal power, broad spectrum, low toxicity and low residue. The disadvantage is that it is unstable in sunlight and air. In the 1970s, After synthetic pyrethroids, It has truly become the mainstay of household sanitary pesticides. After adding organic fillers, adhesives, dyes and other additives, Plates of mosquito-repellent incense came out of the oven. Once lit, Pyrethrin is released into the air. According to its toxicology, It has three different functions: repelling, knocking down and poisoning. In other words, Mosquitoes come into contact with this air through sensory organs, Instinctively evasive. To be sure, The mechanism of action of this insecticide and the dosage in the environment have not yet reached the minimum standard that poses a threat to human beings. [A plate of traditional mosquito-repellent incense releases the same harmful substances as 100 cigarettes], obviously, this sentence has no accurate scientific basis. Poor quality mosquito-repellent incense has DDT. However, how did the Internet [poor quality mosquito-repellent incense poisons a family] happen? In fact, this is the trick of being hit by more toxic insecticides. Poor quality mosquito-repellent incense will produce toxic gases. If the indoor ventilation is poor, It is likely to cause chronic poisoning, Inflammation of nasal mucosa, throat discomfort, dizziness, headache and other symptoms. Compared with regular products, Insecticides for inferior mosquito-repellent incense are mostly DDT and BHC, Instead of low toxicity and high efficiency (pseudo) pyrethroids. These ingredients are more effective in killing insects. But it may poison people. Before the 1980s, Most mosquito-repellent incense products are made of banned insecticides such as DDT and BHC. Its processing auxiliary materials also contain harmful substances (such as arsenide, benzopyrene, etc.), It is very harmful to human health. Nowadays, some illegal manufacturers are still using these substances for profit. When purchasing mosquito-repellent incense, Carefully examine the active ingredients of the product. If the structure is loose, Quickly extinguished after ignition, Or feel that the taste is wrong and the body is not suitable, It should be replaced in a timely manner. In addition, Another mainstream mosquito repellent product, electric mosquito-repellent incense, Its principle of repelling mosquitoes is the same as that of ordinary mosquito-repellent incense. They all contain chemicals with insecticidal function. Therefore, it is difficult to compare who is safer and less toxic. The different fragrance types released by electric mosquito-repellent incense, Not the taste of insecticidal ingredients, But different spice additives. It should be noted that, No matter whether the mosquito-repellent incense is coil or electric, Most of them are suitable for rooms under 15 square meters. The room is too large, The concentration of insecticidal components is reduced, The effect will be reduced. DEET is the most effective ingredient in 2002. In a study published in the New England Journal of Medicine, North Carolina researcher Mark Fradin claimed that Contains DEET (N, N-diethyl m-toluene formamide) mosquito repellent water, Even a small amount can protect the human body from mosquitoes for up to 5 hours. DEET-free mosquito spray, The effect is much worse, Some even took less than 20 minutes. This test result means that, When purchasing skin-smeared mosquito repellent products, It should be seen whether the active ingredient is DEET or the like. The reason why DEET is effective is that, The reason is that it confuses the mosquito’s sense of smell. You know, Mosquitoes live on their keen sense of smell-the carbon dioxide you exhale and the body odor you emit, It is its meal bell. But there are also studies that show that DEET works by making mosquitoes feel uncomfortable. Toilet water uses flower dew oil as the main perfume, Made with alcohol. It repels mosquitoes, It takes advantage of the fact that female mosquitoes do not like strong flower fragrance. However, it volatilizes quickly on the skin. Therefore, the protection period will not last long. Among the popular mosquito repellent products on the market this year, For example, some outdoor deworming (mosquito) ointments and anti-mosquito bracelets are all marked with the banner of pure natural plant citronella. The actual effect is not good, and the protection time is only 3-30 minutes. DEET is one of several mosquito repellent products currently recommended by the U.S. Centers for Disease Control and Prevention, which has been safely applied in the world for 50 years. Another picaridin went on sale in 1998 and proved to be as effective as DEET. At the same time, lemon eucalyptus oil and imonin (IR3535) are also recommended. Which of the following do you choose? Coil mosquito-repellent incense: Each single coil mosquito-repellent incense has a continuous ignition time of 7 hours and cannot be extinguished halfway. The main drug components should not be less than 0.25%, And the effective ingredients must be highly efficient and low toxic, It is harmless to human body. Toilet water or mosquito bite: Toilet water with mosquito repellent ingredients, It often contains imonin recommended by the World Health Organization, Not a bad choice, But it is best to apply it every four hours. Electric mosquito-repellent incense: For people with respiratory diseases (chronic obstructive pulmonary disease in the elderly and asthma in children), the use of electric mosquito-repellent incense is undoubtedly beneficial to their health. Mosquito repellent software: It is said that mosquitoes are repelled by high-frequency ultrasonic waves. In fact, it is to fool the public with physical knowledge. In addition, there is no scientific research to prove that this is an effective method of repelling mosquitoes.