This paper proposes a sustainable, off-grid environmental monitoring system integrating climate control, air pollution, and water quality monitoring using the Internet of Things (IoT) and solar power. The system includes sensors for temperature, humidity, air pollutants, and water parameters, all powered through a solar energy setup. Real-time data is transmitted to an IoT platform, where users can monitor environmental metrics and trigger automation, such as ventilation or purification systems. This solution is ideal for rural areas, smart buildings, and environmental research stations.