MQ135 Air Quality Gas Sensor

MQ135 Air Quality Gas Sensor 

The MQ-135 Air Quality Gas Sensor is a semiconductor gas sensor designed to detect harmful gases and air pollutants. It uses a tin dioxide (SnO?) sensing element whose resistance changes when exposed to gases such as ammonia (NH?), nitrogen oxides (NOx), alcohol, benzene, smoke, and other volatile organic compounds (VOCs). The sensor includes a built-in heater to maintain proper operating temperature and provides an analog output that varies with gas concentration. The MQ-135 is widely used in basic air quality monitoring and environmental sensing applications.

Click here to view related products

Features

• Detects air pollutants and harmful gases (NH?, NOx, alcohol, benzene, smoke, VOCs)
• High sensitivity to poor air quality conditions
• Analog output proportional to gas concentration
• Integrated heater for stable and reliable operation
• Simple interface with microcontrollers (ADC required)
• Compact size and low cost
• Long operational life

Applications

• Indoor air quality monitoring in homes and offices
• Environmental pollution monitoring
• Smart home air quality alert systems
• HVAC system monitoring and control
• Portable air quality measurement devices
• Industrial workplace air monitoring
• Educational and hobbyist electronics projects
• Embedded and IoT air quality sensing systems