Real-time indoor air quality monitoring using the Internet of Things

Globalization and industrialization have brought about their reverberation in the form of different simultaneous harmful components that affects environment's equilibrium conditions. The improper management of such materials has resulted in the contamination of essential ecosystem elements that serve as the foundation for human survival. The solution here is evaluating the degree of ferocity and then initiating preventive and eradication measures based on that information. In this work, air quality-based internet of things (IoT) nodes with MQ135 sensors were set to sense the presence and intensity of air pollutants, then transmit the recorded information to a mobile app and web via GSM module or WiFi system for data analysis and display. The MQ135 sensor monitors air quality since it detects the majority of dangerous gases and can correctly quantify their level. The air quality is consistently monitored and will raise an alarm when the air quality drops below a specific range, it indicates that there are significant amounts of dangerous pollutants like CO, CO2, C
2
H
4
, NO, NO
2,
SO
2
and CH
4
present in the air. The air quality readings taken in PPM are regularly updated to the user through a mobile application to take necessary preventive action.