Air quality detectorThe types of pollutants that can be monitored are diverse, covering gas pollutants, particulate matter, and some meteorological parameters. The following is a detailed introduction to the pollutants that can be monitored:
1、 Gas pollutants
Formaldehyde (HCHO)
Source: Mainly derived from volatile organic compounds released from decoration materials, furniture, coatings, etc.
Harm: Formaldehyde is a toxic gas, and long-term exposure may cause respiratory diseases, allergic reactions, and even increase the risk of cancer.
Detection principle: Electrochemical sensors are usually used to measure formaldehyde concentration by detecting the current changes generated by the chemical reaction between formaldehyde and the sensor surface.
Benzene derivatives (such as benzene, toluene, xylene)
Source: Mainly from decoration materials such as paint, coatings, adhesives, as well as the combustion of fuels such as gasoline and diesel.
Harm: Benzene derivatives are toxic, and long-term exposure may damage the nervous system, hematopoietic system, and even cause cancer.
Detection principle: PartialAir quality detectorUse photoionization detector (PID) or gas chromatography technology to detect the concentration of benzene derivatives.
Total volatile organic compounds (TVOC)
Source: including various volatile organic compounds such as aldehydes, ketones, hydrocarbons, etc., mainly from decoration materials, furniture, cleaning products, etc.
Harm: TVOC may cause symptoms such as headache, eye irritation, and respiratory discomfort. Long term exposure may cause damage to organs such as the liver and kidneys.
Detection principle: Metal oxide semiconductor sensors or photoionization detectors are usually used to detect the total concentration of TVOC.
Carbon monoxide (CO)
Source: Mainly from incomplete combustion processes, such as automobile exhaust and improper use of gas water heaters.
Harm: The binding ability between carbon monoxide and hemoglobin is stronger than that of oxygen. Long term exposure may cause symptoms such as hypoxia and headache, and in severe cases, even endanger life.
Detection principle: An electrochemical sensor is used to measure the concentration of carbon monoxide by detecting the current changes generated by the chemical reaction between carbon monoxide and the sensor surface.
Carbon dioxide (CO ₂)
Source: Mainly derived from human respiration, combustion processes, etc.
Harm: Although carbon dioxide itself is non-toxic, high concentrations of carbon dioxide may lead to a decrease in indoor air quality, causing symptoms such as dizziness and fatigue.
Detection principle: Non dispersive infrared (NDIR) sensors are used to measure carbon dioxide concentration by detecting the absorption of specific wavelength infrared light by carbon dioxide molecules.
Sulfur dioxide (SO ₂)
Source: Mainly from industrial combustion processes, such as exhaust gases emitted from coal-fired power plants, steel plants, etc.
Harm: Sulfur dioxide is an irritant gas that may cause respiratory diseases such as bronchitis and asthma if exposed for a long time.
Detection principle: Electrochemical sensors or ultraviolet fluorescence detectors are used to detect the concentration of sulfur dioxide.
Nitrogen dioxide (NO ₂)
Source: Mainly from automobile exhaust, industrial combustion processes, etc.
Harm: Nitrogen dioxide is a toxic gas that may damage the respiratory tract and increase the risk of lung cancer if exposed for a long time.
Detection principle: Chemical luminescence detector or electrochemical sensor is used to detect the concentration of nitrogen dioxide.
Ozone (O3)
Source: Mainly derived from photochemical reactions of oxygen in the air exposed to ultraviolet radiation, as well as some industrial emissions.
Harm: Ozone is a strong oxidant, and long-term exposure may damage the respiratory tract, causing symptoms such as cough and sore throat.
Detection principle: Use ultraviolet absorption method or electrochemical sensor to detect ozone concentration.
2、 Particulate matter
PM2.5
Source: Mainly from fine particulate matter generated by automobile exhaust, industrial emissions, combustion processes, etc.
Harm: PM2.5 can penetrate deep into the lungs and even enter the bloodstream. Long term exposure may cause respiratory and cardiovascular diseases.
Detection principle: Using the principle of light scattering, PM2.5 concentration is measured by detecting the scattering intensity of particles on light.
PM10
Source: including PM2.5 and larger particles of dust, pollen, etc.
Harm: PM10 can enter the respiratory tract and cause symptoms such as coughing and sneezing. Long term exposure may damage lung function.
Detection principle: The same principle of light scattering is used, but it can detect the scattering intensity of larger particles to measure PM10 concentration.
3、 Meteorological parameters (some equipment can monitor)
temperature
Impact: Temperature is one of the important factors affecting air quality, and high temperatures may exacerbate the volatilization and diffusion of certain pollutants.
Detection principle: Temperature sensors such as thermistors or thermocouples are used to measure temperature.
humidity
Impact: Excessive humidity may lead to mold growth and increase the risk of indoor air pollution.
Detection principle: Capacitive or resistive humidity sensors are used to measure humidity.