How to Build a Mini Air Quality Monitoring System using ESP32

Futurism Tech Brief By HackerNoon

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Build a DIY air quality monitoring system: How to face the problem of impure air quality due to the increase in pollutants and impurities mixed with the air.
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This is a mini IOT based air quality monitoring system that will monitor the air quality over a webserver using the internet. It will monitor and alert users as and when the levels cross a specified limit. The MQ135 gas sensor is used which will give us output in the form of voltage levels and we convert it into PPM (parts per million). Real time PPM values can also be viewed in the Arduino Serial Monitor. The sensor is capable of sensing gases like NH3, NOx, alcohol, Benzene, smoke, CO2 and other harmful gases.