Smart Indoor Air Pollution Monitoring Station

The term "Air Pollution" generally refers to the outdoor air pollution, mainly caused by combustion of fossil fuels by industrial plants, smog, and emissions from cars and trucks. But the air indoors can also be polluted. Indoor air pollution refers to the contamination of indoor air. It may cause harmful health issues. The main sources of indoor air pollution are pesticides, chimneys which contain pollutants such as particulate matter, biomass smoke, fireplaces, moulds, and environmental tobacco smoke. The pollutants are nitrogen dioxide (NO
₂
), Ammonia, sulphur dioxide (SO
₂
), radon, carbon monoxide (CO), carbon dioxide (CO
₂
) and benzene. In this Internet of Things (IoT) project, wireless air pollution monitoring system is built, which sends alerts to the user by using the Internet, when the concentration of pollutants measured goes beyond safer level. This system can be preferred over the existing systems because the alerts sent by the system can be received by the user on mobile phone from any distance irrespective of whether it is connected to the Internet. The microcontroller used is the NodeMCU Dev board v1.0 which consist of ESP8266, Wi-Fi enabled chip. The sensor used is MQ135, air quality sensor, which along with microcontroller can be used to monitor the pollution indoors.