Mental health is a condition in which a person is free from all symptoms of mental disorders. Anxiety disorder is the most common mental disorder experienced by adolescents and depression reaches 26.7%. The purpose of this study was to determine the knowledge and attitudes of adolescents through poster media both before and after interventions related to mental health. The type of research used is quantitative with one group pre-test post-test method, with intervention using poster media and questionnaires as data collection tools at SMAN 5 Jambi City. The sample in this study amounted to 30 respondents and was tested using the Paired T-Test statistical test. The pre-test results showed that the percentage of knowledge before the intervention was 66.7% to 100% after the intervention and the percentage of attitude before the intervention was 76.7% to 96.7%. After the intervention on mental health, there was an increase in knowledge with P-Value = <.001 and an increase in attitude with P-Value = <.001. This study shows that there is an influence on knowledge and attitudes before and after the intervention of poster media on mental health at SMAN 5 Jambi City. It is recommended to hold interactive discussions with counseling teachers in schools aimed at increasing adolescents' understanding of mental health and being able to reduce the stigma of the surrounding environment so that students do not feel afraid or embarrassed to seek help.

Dengue Hemorrhagic Fever (DHF) remains a major public health issue in Indonesia, particularly in endemic areas like Simpang III Sipin Village. This disease is transmitted by Aedes sp mosquitoes, and the presence of their larvae is a key indicator of the potential spread of DHF. Environmental conditions, such as water reservoirs and humidity, alongside community behaviors, play significant roles in supporting the growth of these mosquito larvae. Therefore, research is needed to identify the factors influencing the presence of Aedes sp larvae. Methods: This study utilized a cross-sectional design with a quantitative approach. The sample consisted of 143 households, selected using purposive sampling techniques. Data were collected via questionnaires and direct observations. Additionally, measurements of environmental conditions such as air humidity and temperature were taken using a hygrothermometer. The variables under study included knowledge, attitudes, behavior regarding water reservoir drainage (TPA), number of TPAs, air humidity, and air temperature. Results: Data analysis was conducted using the Chi-Square statistical test to determine the relationships between the variables. The results indicated that factors like knowledge level (p = 0.008), attitude (p = 0.008), behavior related to draining water reservoirs (p = 0.001), number of water reservoirs (p = 0.013), and air humidity (p = 0.004) were significantly related to the presence of Aedes sp larvae. However, air temperature did not show a significant relationship (p = 0.675). Conclusion: High humidity environments encourage the growth of mosquito larvae, and insufficient knowledge and inadequate preventive behaviors contribute to increased mosquito populations, exacerbating the risk of DHF transmission.