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 community participation in controlling mosquito breeding environments to prevent diseases like dengue and malaria [1][2] - Mosquitoes go through four life stages, and eliminating standing water is crucial as even a bottle cap of water can breed hundreds of mosquitoes [1][2] - Regular cleaning of potential water sources can reduce mosquito density by over 80% [1] Group 2 - In community and park settings, measures such as filling low-lying areas and regularly cleaning ponds are recommended for ecological mosquito control [2] - Physical mosquito control methods, such as using mosquito nets and electric mosquito swatters, are highlighted as safe and effective [2] - Chemical control methods should be used judiciously to avoid environmental contamination and to prevent mosquitoes from developing resistance [2] Group 3 - Travelers to malaria-endemic regions are advised to carry mosquito nets and repellents, and to seek medical attention if they exhibit symptoms of malaria or dengue upon returning [3]