The MQ-135 is a versatile air quality sensor designed to detect a wide range of harmful gases in the environment. It is widely used in indoor air quality systems, pollution monitoring devices, industrial safety systems, and environmental measurement projects.
This sensor can detect several gases, including:
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Ammonia (NH₃)
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Nitrogen Oxides (NOx)
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Benzene
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Alcohol vapors
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Carbon dioxide (approximate sensitivity)
The MQ-135 uses a sensitive SnO₂ (tin oxide) layer that changes resistance when exposed to gas, allowing microcontrollers like Arduino, ESP32, and Raspberry Pi to measure gas concentration.
It is known for its stability, low cost, and suitability for both hobby and professional applications.
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