There are many factors affecting air quality, such as vehicle exhaust emissions, domestic waste incineration, industrial production emissions, etc. For a city, the denser the population, the worse the air quality. Therefore, in addition to industrial production, the factors affecting air quality, automobile exhaust pollution and particulate matter pollution are the two major factors affecting urban air quality.

Poor air quality not only causes environmental degradation, but also seriously affects our daily life and health. Therefore, it is necessary to monitor the air quality in real time. Since the air quality indicators that need to be monitored in different environments are different, this paper analyzes the indoor and outdoor air quality indicators.

1. Indoor air quality monitoring indicators

We spend more than 70% of our time in the indoor environment, and indoor environmental pollution has become one of the killers that seriously affect human health.

Good indoor air quality is the most important factor to ensure good health. Unqualified indoor air can lead to physical discomfort and poor health (such as headache, chest tightness, drowsiness, skin allergies, eye fatigue, frequent colds, etc.). Pregnant women, children, the elderly, office workers, and people with respiratory and cardiovascular and cerebrovascular diseases are more vulnerable to poor indoor air quality. Here is a list of key indoor pollutants:

1. Indoor PM value

The degree of indoor exposure to outdoor PM depends on two factors, one is the air circulation rate, and the other is the particle removal rate; the air circulation rate can be regarded as the wind speed; the indoor particle removal rate can basically be measured by observation, and can also be measured by Many physical means are enhanced, PM2.5 is slower, PM10 is faster (gravity sedimentation is faster), then controlling the air circulation rate can further enhance the buildings barrier rate against air pollution.

2. Formaldehyde, TVOC

Among indoor air pollutants, in addition to formaldehyde, benzene series, TVOC, etc. cannot be ignored.

As early as 2018, a Geological Supervision Bureau once reported the results of the indoor air quality test of residents in 2018. From the test data, the pollutants with the greatest impact on the unqualified rate of indoor air quality are TVOC, followed by formaldehyde and benzene. Relatively small.

Air pollutants such as benzene series, formaldehyde, TVOC, etc. are mainly from the continuous volatilization of house decoration or new furniture. This kind of air pollution is difficult to eradicate at one time. Therefore, we must choose products from regular manufacturers when choosing decoration materials; Life can use plants to reduce pollution. Such as green dill, lucky bamboo, grapefruit peel, pineapple, tea and other natural plants adsorption and purification of indoor air pollutants.

2. Indoor air quality monitoring indicators

Outdoor air quality monitoring should be accurately called ambient air quality monitoring or atmospheric monitoring. Its main pollutant items are from the six major air pollutants mentioned in the "Ambient Air Quality Standard", namely: PM2.5, PM10, sulfur dioxide, nitrogen dioxide, carbon monoxide and ozone. The monitoring of these pollutants constitutes what is known as the Air Quality Index (AQI).

Usually the AQI values on our mobile phones are measured by the local environmental protection bureau using the air quality testing station. The instruments and equipment used in the AQI Sensor are based on the monitoring methods stipulated in the "Ambient Air Quality Standards", also known as the national standard method. instrument. The monitoring equipment in the air quality monitoring station is generally large in size, with high monitoring accuracy, and most of them are single-parameter monitoring instruments. Maybe a set of equipment is only for monitoring and analyzing one air pollution parameter. Therefore, the monitoring of ambient air quality is a combination of multi-parameter data.

AQI Sensor monitoring data is accurate, but the construction cost is relatively expensive and the monitoring range is limited, so small ambient air quality stations or direct application of air quality sensors are more commonly used at present. These instruments usually use the sensor principle of non-national standard method and are relatively inexpensive. They can monitor multiple air quality factors at the same time, and also have the advantages of wide application scenarios and convenient installation.