MQ135 Air Quality Gas Sensor Module

MQ135 Air Quality Gas Sensor Module The MQ-135 Air Quality Gas Sensor Module is a semiconductor gas sensor board used to detect a range of air pollutants and harmful gases. It employs a sensitive tin dioxide (SnO?) sensing element whose resistance changes in response to gases such as ammonia (NH?), nitrogen oxides (NOx), alcohol, benzene, smoke, and other harmful VOCs (volatile organic compounds). The module includes an integrated heater to maintain the sensing element at its optimal operating temperature and provides an analog output that varies with gas concentration, making it easy to interface with microcontrollers like Arduino, ESP32, or Raspberry Pi (with ADC). It’s commonly used in air quality monitoring systems and environmental sensing projects.Click here to view related products FeaturesDetects air pollutants and harmful gases, including VOCs (e.g., ammonia, benzene, NOx), alcohol, smoke, and moreHigh sensitivity to a range of gasesAnalog output proportional to gas concentrationRequires integrated heater for stable operationSimple interface with microcontrollers (ADC required)Compact, low-cost sensor suitable for prototyping and embedded systemsLong operational lifeTypical ApplicationsIndoor air quality monitoring (homes, offices, classrooms)Environmental and pollution sensingSmart home air quality alertsHVAC system monitoring and controlPortable air quality detectorsIndustrial environment air monitoringEducational and hobbyist electronics projectsEmbedded and IoT air sensing applications*Product image for illustration purposes only, actual product may vary.