IoT Based Low Cost Air Quality Monitoring Device

Background: In recent years, the air we breathe has been rapidly declining in quality, leading to the premature deaths of approximately seven million individuals worldwide each year. In light of these concerning facts, it is essential that citizens across the globe have access to transparent information about the quality of their environment. By doing so, they can make informed decisions before it is too late. Methods: To address the above need, a prototype model for an air quality monitoring system has been designed. This system consists of a Node MCU ESP32 microcontroller, a MQ-2 gas sensor, MQ-135 gas sensor and a DHT-11 temperature and humidity sensor module and IoT. Findings: The proposed integrated system can prove a very useful tool to carry out the steps to control pollution levels in the upcoming years when the pollution is increasing to a great alarming level. It is highly reliable and it can also be used at remote places. The sensors selected here provides accurate data for the system to carry out its function, and it can be said that the ratio of performance to cost of these sensors is quite high. The data collected by the sensors is transmitted to the processing module of the system, which is controlled by the microcontroller ESP32. Novelty: The proposed model is very compact and low cost. It can provide the data when and wherever needed with the help of Internet of Things