Core Viewpoint - The article discusses the increased activity of mosquitoes in autumn and the importance of effective mosquito repellent methods due to the prevalence of diseases like Chikungunya and Dengue fever [1][4]. Group 1: Mosquito Activity - Autumn mosquitoes are more aggressive than summer mosquitoes, with peak activity occurring when temperatures are between 25-30℃ and humidity is at 70%-80% [4][6]. - Mosquito density typically follows a "camel-shaped" curve, with a peak in activity during August and September after a decline in June due to high temperatures [6]. Group 2: Key Components of Mosquito Repellents - The effectiveness of mosquito repellents depends on their active ingredients and concentration, which determines the duration of protection [7]. - Three main categories of effective mosquito repellent ingredients are recognized: chemical, plant-based, and insecticidal [7]. Group 3: Chemical Repellents - DEET is the most effective chemical repellent, with concentrations of 5%-30% providing 2-12 hours of protection, suitable for prolonged outdoor activities [7]. - Other chemical repellents like IR3535 and Picaridin are less irritating and suitable for children, offering 4-8 hours of protection [9]. Group 4: Plant-Based Repellents - Lemon eucalyptus oil is noted for its effectiveness but has a shorter duration of 2-6 hours and is not recommended for children under 3 years due to potential allergic reactions [9][11]. - Natural ingredients like citronella and menthol are less effective and more suitable for short-term use [9]. Group 5: Insecticidal Products - Pyrethroids, commonly found in mosquito coils and electric repellents, can disrupt mosquito nervous systems and provide both repellent and insecticidal effects, but require proper ventilation [9]. Group 6: Market Products and Consumer Caution - Many popular products claiming to repel mosquitoes using ultrasound or magnetic fields lack scientific backing and should be approached with caution [11]. - Products containing plant oils often do not provide comprehensive protection and may only work in close proximity [11]. Group 7: Contextual Use of Repellents - Different scenarios require tailored mosquito repellent solutions, such as using sprays with 20% DEET or 10% Picaridin for outdoor activities, and milder formulations for children [12][14]. - Indoor protection can be achieved with electric mosquito repellents, while physical barriers like nets are recommended for infants [14][16].

Group 1 - The article emphasizes the importance of mosquito control in preventing Chikungunya virus transmission, highlighting two main strategies: active killing and passive defense [1][2] - Active killing methods include electric mosquito repellent, traditional mosquito coils, and aerosol insecticides, while passive defense involves using repellents containing DEET and IR3535 to reduce mosquito bites [1][2] - The article mentions that products claiming to have mosquito-killing or repelling effects must obtain a pesticide registration number according to national regulations, ensuring consumer safety [1] Group 2 - Consumers are advised to choose products based on their environment, such as electric mosquito liquid for indoor use and mosquito coils for outdoor spaces [2] - It is crucial to eliminate mosquito breeding sites by clearing standing water in household items like flowerpot trays and discarded containers [2] - Recommended passive defense methods include using repellents with active ingredients like DEET and IR3535, which interfere with mosquitoes' olfactory systems to reduce bites [3] Group 3 - The article suggests that physical barriers, such as wearing light-colored long-sleeved clothing and using screens or mosquito nets, can enhance passive defense against mosquitoes [3] - It is advised to apply mosquito repellent directly to the skin rather than clothing, as some ingredients may irritate skin if they enter bite wounds [3]