Description

The MQ-135 Air Quality Gas Sensor Module is a versatile gas detection sensor designed to monitor indoor air quality by detecting harmful gases such as ammonia (NH₃), nitrogen oxides (NOₓ), benzene, alcohol, smoke, and carbon dioxide (CO₂). It provides both analog and digital outputs, making it suitable for Arduino, ESP32, ESP8266, STM32, Raspberry Pi, and other embedded platforms. It is ideal for environmental monitoring, smart home systems, and industrial safety applications.