This project uses MQ-135 gas sensor for detecting the pollutant level in the air.
The MQ-135 sensor can detect include NH3, NOx, alcohol, Benzene, smoke, CO2 , etc.
Operating principle:
MQ-135 gas sensor applies SnO2 which has a lower conductivity in the clear air as a gas-sensing material. In an atmosphere where there may be polluting gas, the conductivity of the gas sensor raises along with the concentration of the polluting gas increases. MQ-135 performs a good detection to smoke and other harmful gas, especially sensitive to ammonia, sulfide and benzene steam. Its ability to detect various harmful gas and lower cost make MQ-135 an ideal choice of different applications of gas detection.