MQ-135 Gas Sensor Outputs

Hi everyone!

I’m trying to use the MQ-135 Gas Sensor for an air-quality monitoring project run on a Raspberry Pi Zero W. The hope is to pull data from the MQ-135 and 3 other sensors from Adafruit to display on the Adafruit I/O platform but I haven’t found anything in the datasheet for the 135 or the ADC 121C that explain how to interpret the raw output as the presence or absence of a particular gas.

Would anyone be able to provide guidance as to how to read the output? Thanks!

i will recommend checking out this


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Thank you Bhaskar! That looks like exactly what I need!