IoT devices play a crucial role in environmental monitoring by providing real-time data on various environmental factors such as air quality, temperature, and humidity. These devices collect and transmit data to centralized systems for analysis, helping organizations monitor conditions and make informed decisions. They can be deployed in various applications, including agriculture, urban planning, and disaster management. By leveraging IoT technology, stakeholders can track environmental changes, respond to issues promptly, and optimize resource use, ultimately aiding in sustainability efforts.