Gravity: HF Sensor - module with a hydrogen fluoride concentration sensor

The sensor is designed for indoor air quality testing. The main gas detected is carbon monoxide, alcohol, acetone, thinner, formaldehyde and other slightly toxic gases. It is compatible with 5V and 3.3V power supply. Seeed Studio 101020078

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

Module with ENS160 gas sensor for measuring the concentration of carbon dioxide (eCO2) and volatile organic compounds (TVOC) in the air. It communicates via the I2C or SPI interface. Adafruit 5606

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 SGP30 gas sensor. The sensor communicates via the I2C interface. SGP30 system contains several elements reacting to various metal oxides, which allows for more accurate determination of air quality. Adafruit 3709

BOB-08891 - Gas Sensor Breakout Board

Module with integrated BME688 gas, pressure, temperature and humidity sensor placed in one MEMS housing. It is equipped with an I2C interface. Adafruit 5046

Air quality sensor module based on SGP30 system. The board has been equipped with Qwiic connectors. SparkFun SEN-16531

Carbon monoxide sensor module made in MEMS technology. It allows gas detection in the range of 5 to 5000 ppm and has an analog output. DFRobot SEN0564

The module with a methane concentration sensor (MQ-4) in the range up to 10,000 ppm, has an analogue output and an output triggered by exceeding the threshold of sensitivity.

Module with an analog MQ7 carbon monoxide sensor. It is powered with the voltage of 5 V and has an analog output. DFRobot SEN0132

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 gas sensor designed to monitor indoor air quality. It was based on the AMS CCS811 system that allows the detection of volatile organic compounds (VOCs) in the air. Digilent 410-386

Gravity: Analog Infrared CO2 Sensor is a high precision analogue CO2 sensor. It measures CO2 content in the range of 0 ... 5000ppm and is compatible with all devices with ADC function. DFRobot SEN0219

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

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