PMS5003 High Accuracy Particle Concentration Sensor

High sensitivity to Ammonia (NH3), Nitrogen oxides (NOx), Alcohol, Sulphides, Benzene (C6H6), CO2, smoke and other harmful gases.  The MQ-135 sensor is to sensible for other gasses in the air so that is not possible to get good values for CO2 from it.
MQ-135 Air Quality Sensor features:
- Main chip: MQ-135 natural gas sensor and comparator LM393
- Working voltage: 5V
- Current: 150mA
- Digital output: TTL 0/1
- Analog output: analog voltage sensing value
- Quick response features:
- Detection concentration:
   10ppm - 300ppm NH3
   10ppm - 1000ppm Benzene
   10ppm - 300ppm Alcohol
- Adjustable sensitivity with the potentiometer
- Size: 32mm x 20mmx 18mm

Air quality sensor with high precision whose SDS011 uses laser dispersion to detect particle concentration between 0.3 and 10 um in the air.

With digital output by USB (UART) and built-in fan. It is a powerful sensor, fast (response less than 10s), accurate and reliable.

Low power CO2 sensor MH-Z1311A, the current consumption is only 150-200uA, waterproof and anti-corrosion, high sensitivity, additionally characterised by excellent linear output. It is very popular used for battery monitors and IAQ devices.

CO2 sensor model MH-Z19C. High precision working voltage 5.0±0.1V DC. The measuring range is between 0 and 5000 ppm. It has a low power consumption. UART and PWM output.

This SparkFun CO2, humidity and temperature sensor incorporates Sensirion's new generation of SCD40 photoacoustic CO2 sensors for highly accurate environmental readings. The sensor is capable of detecting concentrations from 0 to 40000 ppm with high precision above 400-2000 ppm ±(50 ppm+5%). The SCD40 has an integrated CMos® temperature and humidity sensor for greater precision.

This air purifier uses a HEPA filter to remove viruses, bacteria, mould, dander, etc. safely. The dehumidifier regulates humidity in the bathroom, kitchen, etc. Filters up to 99.5% of dust, pollen, tobacco smoke, mould spores and pet dander. Keeps the environment clean.

The Carbon Monoxide sensor is a low-power digital gas sensor which has a CCS811 sensor and an 8-bit microcontroller, contains an analog-digital converter so that it can detect indoor air quality which can detect monoxide carbon (CO) and a wide range of volatile organic compounds (VOCs). It is a sensor designed to monitor air quality inside personal devices such as mobile devices and smart watches, with low power consumption that can be used with battery

This module is a dust sensor capable of detecting more than one micron of dust particles.
It has two types of output: output of 4V high-level signal for a clean environment and 0.7V low-level signal for a particle-laden environment.
Its power supply is 5VDC and the particle detection range is maximum at 8000 units per 283ml. Dust Sensor Module PPD42NS PM2.5 features:
- Supply voltage: 5VDC
- Working current: 90mA
- Sensitivity: 0.5V / ( 0.1 mg / m3)
- Particle detection minimum value: 1 micron
- Output mode: Hi = 4V impulses (clean environment); Lo = 0.7V (charged environment)
- Temperature working: 0-45 ° C
- Working humidity: 0-90% RH
- PCB size: 59x45x22 mm

The ZP07-MP503 air quality module offers high sensitivity with low power consumption and long life. Calibration before shipment from 10 seconds to 3 minutes max. with automatic warm-up function. Automatic fault check.

This air purifier uses a HEPA filter to safely remove viruses, bacteria, mold, mildew, dander, etc. Filters up to 99.5% of dust, pollen, tobacco smoke, mould spores and pet dander. Keeps the environment clean.