There are 10 methods to measure air quality.

There are only eight specific methods for measuring air quality:

1, spectroscopy: using infrared, ultraviolet, visible light and other spectral methods to detect gas pollutants in the air through the characteristics of absorbed light.

2. Mass spectrometry: ionize the compounds in the air, analyze their mass by mass spectrometer, and determine their composition and concentration.

3. Electrochemical method: Using electrodes as sensors to measure the concentration of gas pollutants in the air.

4. Physiological observation method: After the house is ventilated for a period of time, formaldehyde may still exceed the standard. If a family member lives in a new home, it is easy to get sick and have skin allergies. There must be serious indoor air pollution. At this time, the indoor air should be treated immediately and the family members should be sent to the hospital for medical treatment.

5. Animal and plant observation method: If the small animals at home are easy to get sick and don't like to eat, the activities will be reduced and the plants will wither in large numbers, which means that the formaldehyde content at home may exceed the standard.

6. Online shopping detector detection: Although the simple detector for online shopping is cheap, its accuracy is usually poor and misleading. Especially when the indoor formaldehyde exceeds the standard, the detector may not be able to display the standard and is not recommended.

7. On-site inspection of professional companies: select authoritative institutions for inspection.

8, SO2- formaldehyde solution absorption method; NO2- chemiluminescence method; Co-non-dispersive infrared absorption method or gas chromatography; Carbon dioxide is not separated by infrared gas analysis or gas chromatography or volumetric titration; Ammonia ion selective electrode method or salicylic acid spectrophotometry.

Air quality grade

1, Grade I: excellent, and the air quality index is 0 to 50. The air quality is good, there is basically no air pollution, and all kinds of people can move normally.

2. Grade II: Good, with air quality index of 5 1 to 100. The air quality is acceptable, but some pollutants may have a slight impact on the health of a very small number of extremely sensitive people, and such people should reduce outdoor activities.

3. Grade III: light pollution, air quality index 10 1 to 150. The symptoms of susceptible people are slightly aggravated, and the symptoms of healthy people are aggravated. Children, the elderly and patients with heart disease and respiratory diseases should reduce long-term and moderate outdoor exercise. It is recommended to open the window frequently to keep the air unobstructed and breathe more fresh air.