China Indoor Decoration Association Environmental Inspection Center survey statistics show that indoor air pollution level is often 2~3 times higher than outdoor air pollution.
Even dozens of times, the number of deaths caused by indoor air pollution in China is more than 100 thousand each year.
Indoor air pollution is a "indoor invisible killer", which seriously threatens the health of the human body. It is urgent for the public's attention and attention. Therefore, we must enhance people's awareness of environmental health and find out where the indoor air pollution is coming from.
People often enter the living room or office, and it is easy to bring outdoor pollutants into the room. The most common way is to enter the room from outside, and bring outdoor pollutants into the office or living room through clothing or skin as a carrier.
In addition, indoor air pollution caused by human activities such as metabolism, cooking, smoking, pet raising and other human activities is a man-made pollution。
Metabolic activity of human body
There are more than 500 kinds of chemicals produced in the process of human metabolism. The main pathways include respiratory process and skin cell detachment. According to the Ministry of environmental protection (2013), the long term respiration of urban male and female groups in the age group of 18~59 in China is 18.7m /d and 15.0m /d respectively, and there are about 150 kinds of chemical species in the respiratory tract. The skin, as the largest organ of human body, has more than 200 wastes discharged. Scientific research has found that the cells that human skin shedding is the main component of dust in indoor air.
The main pollutants produced by cooking are two kinds of smoke and smoke。 Cooking oil fume contains a variety of toxic chemical components, which has lung toxicity, immunotoxicity, carcinogenicity and health hazards to the body。 From the study of Li Jian (2004) and Zhang Jie (2007), the chemical components of cooking oil smoke are different from the different factors such as the variety of the oil, the heating temperature, the processed food and so on。 There are 20 kinds of organic compounds in the cooking oil fumes of the advanced soybeans, of which 5 belong to the EPA (Environmental Protection Agency) and the priority monitor in China。 Researchers from abroad have detected 140 compounds from cooking fumes, including 25 aldehydes, 1 aromatic hydrocarbons and 30 furans。
In addition to fumes, China's urban residents use coal, liquefied petroleum gas or natural gas as fuel. In the combustion process, carbon monoxide, nitrogen oxides, carbon dioxide, sulfur dioxide and incomplete combustion of hydrocarbons and suspended particles will be produced in the combustion process, which will cause danger to the human body.
Smoke produced by smoking is a common indoor air pollutant。 Nearly 4000 chemicals have been identified, many of which are carcinogenic, teratogenic, and mutagenicity。 Epidemiological investigation shows that smoking can lead to lung cancer and respiratory diseases, and is also related to heart disease。 They exist in gaseous and aerosol states。 Gaseous pollutants include CO, CO, NOx, ammonia, formaldehyde, alkanes, olefins, aromatic hydrocarbons, oxygenated hydrocarbons, hydrazine and so on。 The main components of aerosols are tar and nicotine, and each cigarette produces 0。5~3。5mg nicotine。 Tar contains a lot of carcinogenic substances, such as polycyclic aromatic hydrocarbons, arsenic, cadmium and nickel, etc。 (SID and Su Guang he, 2005)。
Sun Yongmei and other (2001) analyzed the composition of cigarette smoke and its biological oxidation ability to DNA from the molecular biological level, and found 157 and 78 organic pollutants and 5 inorganic elements. The biooxidation ability of cigarette smoke to DNA is mainly due to the presence of a large number of organic pollutants, including quinones, polyphenols and other compounds. Usually, it takes only a few minutes to burn a cigarette, and the pollution of the cigarette is peak after burnout, and then it may take several hours to recover the base concentration.
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