CO and NO₂ concentration monitoring based on internet of things

In today’s era, industrial development has shifted towards the use of machines and means of transportation automatically. The development of this industry raises various environmental problems, notably the deterioration in air quality which is getting worse in several areas of Indonesia. In Indonesia, the concentrations of CO and NO₂ gases have the highest concentrations compared to the concentrations of other harmful gases. CO gas is known to be toxic to the human body which can cause health problems and can even cause death if exposed to high concentrations. Whilst NO2 gas can also cause health problems. In this study, we use IoT technology by making use of NodeMCU as a microcontroller and temperature, humidity, CO, and NO₂ sensors for monitoring CO and NO2 concentrations in real-time. The data obtained will be sent to the cloud for data storage so that users can access it via a web application. Based on the results, the maximum value of CO concentration is 13.28 ppm and the minimum value is 1.23 ppm. Whilst the maximum value of NO₂ concentration is 18.63 ppm and the minimum value is 16 ppm. Furthermore, this system can help users to get CO and NO₂ information from a web-based application.