To make Air Pollution Monitoring using NodeMCU and MQ135 Gas Sensor.
USB Cable
NodeMCU ESP8266
MQ135 gas sensor
Bread Board
Jumper Wire
The MQ-135 Gas sensor can detect gases like Ammonia (NH3), sulfur (S), Benzene (C6H6), CO2, and other harmful gases and smoke. Similar to other MQ series gas sensors, this sensor also has a digital and analog output pin.