Update: 2020-07-07 14:42 Source: LUFTMY
Due to frequent visits of smog and excessive outdoor PM2.5 concentration, authorities will urge people to try not to go out in such weather or wear masks when going out.But is it safe to stay indoors?In fact, it is also possible to produce dust in home life. In addition, indoor air is not easy to circulate in a small space, and sometimes indoor PM2.5 concentration is even higher than outdoor.In order to detect indoor dust concentration more intuitively and scientifically, dust sensor can be used.
Sources of indoor dust concentration
China has more than 300 million smokers, more than any other country in the world, with more than one million people dying every year from smoking-related diseases, according to the Chinese Center for Disease Control and Prevention.The smoke from smoking not only does harm to people's health, but also causes air pollution.When smoking indoors, the concentration of PM2.5 rises significantly.In addition to the well-known nicotine and carbon monoxide, cigarettes produce many tiny particles when they are not completely burned, most of which are only about 1 micron in diameter and fall into the PM2.5 category.
2. Interior decoration
The pollution generated during the interior decoration process is mainly construction dust, which is a big source of PM10 and PM2.5. Experiments show that the CONCENTRATION of PM2.5 in the decorated area is slightly higher than that in the undecorated area, and the concentration of PM2.5 in the room when the workers cut tiles is four times that before the cutting.According to a draft of the Ministry of Environmental Protection's Policy on Fine Particulate Air Pollution Prevention and Control (Trial), household decoration dust has been listed as one of the sources of PM2.5 pollution, an environmental expert said.
3. Cooking soot
In the cooking process, cooking oil and food under high temperature conditions, will occur thermal decomposition or pyrolysis, forming a mixture of gas, liquid and solid 3 organic forms, namely lampblack.According to the different forms, the mixture of liquid and solid particles is called oil mist. The particle size is between 0.01 and 10 microns, which fully meets the standard of PM2.5 particles.The gaseous part is discharged as volatile organic compounds (VOCs).Oil mist directly forms PM2.5, while VOCs also form PM2.5 through chemical reactions in the air.In addition, when coal, liquefied natural gas or natural gas is burned, sulfur and hydrogen oxides are also important sources of PM2.5 pollutants.
Dust sensor is applied to indoor dust concentration detection
In order to maintain indoor air quality and reduce the harm caused by dust, many households have purchased air purifiers to purify indoor air.Dust sensor is an essential component of air purifier to measure air quality. More and more air purifiers use dust sensor, which has achieved the purpose of intelligent control equipment.The dust sensor outputs the signal value after sampling, and the main control panel of the air purifier adjusts the purification gear according to the received signal.