Gravity: Analog LPG Gas Sensor (MQ5) - module with LPG sensor

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

A sensor that detects the concentration of ammonia. Equipped with a factory calibrated probe. It communicates via the I2C interface, UART or analog output. DFRobot SEN0469

Module with an analog MQ8 hydrogen sensor. It is powered with the voltage of 5 V and has an analog output. DFRobot SEN0133

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 ozone. Equipped with a factory calibrated probe. It communicates via the I2C interface, UART or analog output. DFRobot SEN0472

Module with an analog gas sensor. It allows you to measure the concentration of NO, NO2 and H2. DFRobot SEN0441

Module with the alcohol sensor MQ303A. The board is equipped with a Grove connector and communicates via an analog interface. Seeed Studio 101020044

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

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

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

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.

The MQ-9 sensor allows the measurement of gas concentrations such as carbon monoxide, propane and methane. Sensor measuring range: 10 - 10,000 ppm

Module with air quality sensor SGP30. It allows you to read the concentration of VOC (TVOC) and eCO2 and communicates via the I2C interface. Pimoroni PIM480

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

The SCD-41 CO2, temperature and humidity sensor module provides high accuracy readings. It is equipped with a Qwiic connector and communicates via an I2C interface. SparkFun SEN-22396

Air quality sensor module based on the SGP40 system. It uses CMOSens technology by Sensirion and provides information on the concentration of volatile organic compounds (VOC). Adafruit 4829