MQ-139 Gas Sensor (Air Quality / VOC Detection)

The MQ-139 Gas Sensor is designed for detecting harmful gases and volatile organic compounds (VOCs) in the air. It is particularly useful for monitoring indoor air pollution levels in residential, commercial, and industrial environments. With stable performance and long operational life, it is widely used in smart air quality systems and environmental monitoring devices.

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All MQ sensors use SnO₂ semiconductor technology with resistance varying according to gas concentration.
Typical detection ranges: 10 ppm to 10,000 ppm depending on the gas type.
Require preheating (20–60 seconds or more) for stable readings.
Provide analog output + digital threshold output (via comparator board).

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