Adafruit gas sensor with SGP30 system

The module with a smoke sensor and flammable gases (MQ-2) allows the measurement of gas concentrations such as natural gas, hydrogen as well as smoke and ethanol. The module has an analogue output and an output triggered by exceeding the threshold of sensitivity. modMQ-2

Module with an analog sensor of carbon monoxide and combustible gases (methane, propane) MQ9. It is powered with the voltage of 5 V and has an analog output. DFRobot SEN0134

Module with Sensirion SCD30 sensor, which enables CO2, temperature and humidity measurement. The board is equipped with a Grove connector and communicates via the I2C interface. Seeed Studio 101020634

Sensor that detects the concentration of chlorine. Equipped with a factory calibrated probe. It communicates via the I2C interface, UART or analog output. DFRobot SEN0468

Module with a smoke concentration sensor made in MEMS technology. It allows gas detection in the range of 10 to 1000 ppm and has an analog output. DFRobot SEN0570

MQ-135 Gas Sensor

Digital gas sensor solution that senses a wide range of Total Volatile Organic Compounds (TVOCs), including equivalent carbon dioxide (eCO2) and metal oxide (MOX) levels, intended for indoor air quality monitoring in personal devices such as watches and phones, but we’ve put it on a breakout board so you can use it as a regular I2C device. SEN-14193

The module with an alcohol sensor (MQ-3), allows you to measure the concentration of ethanol in the air. The module has an analogue output and an output triggered by exceeding the threshold of sensitivity.

Gravity: Formaldehyde (HCHO) Sensor is a module for measuring the concentration of formaldehyde (methane) in the air. It can be supplied with voltage in the range of 3.3 ... 6V. DFRobot SEN0231

Module with CO2, temperature and humidity sensor SCD-41. Equipped with a STEMMA QT connector, it communicates via the I2C interface. Adafruit 5190

Digital sensor dedicated to measuring carbon dioxide (CO2), air temperature and relative humidity. High performance, fast response and excellent stability make it an ideal solution for a variety of applications such as greenhouses, cities, poultry farms and transport stations. Seeed Studio 101991029

SCD41 CO2, temperature and humidity sensor module. Equipped with a Gravity connector, it communicates via an I2C interface. DFRobot SEN0536

Module with a BME680 sensor that allows you to measure temperature, humidity, pressure and gas detection. The board is equipped with a Grove connector and communicates via I2C and SPI. Seeed Studio 101020513

Adapter for MQ gas sensor with potentiometer for analog signal calibration. MOD 72

The MQ-3 sensor allows you to measure the concentration of alcohol vapors. The measuring range of the sensor is in the range of 0.05 mg / L to 10mg / L, and an analogue signal is obtained at the output.

Module with a CO2 sensor based on the XENSIV PAS CO2 system from Infineon. It enables precise measurement of CO2 concentration in ppm via I2C, UART and PWM interfaces. SparkFun SEN-2295