formaldehyde
Formaldehyde is a colorless and soluble irritating gas. Wood-based panels such as particleboard, density board, plywood, adhesive and wallpaper are the main sources of formaldehyde in the air, and the release period is as long as 3 ~ 15 years. It can be absorbed through respiratory tract, and the harm of formaldehyde to human body has the characteristics of long-term, latent and concealed. Long-term inhalation of formaldehyde can cause serious diseases such as nasopharyngeal carcinoma and laryngeal cancer.
benzene
Benzene is a colorless gas with a special aromatic smell. Glue, paint, coating and adhesive are the main sources of benzene in the air. Benzene and benzene series can be anesthetized by the central nervous system after being inhaled by human body; It can inhibit human hematopoietic function, reduce red blood cells, white blood cells and platelets, and increase the incidence of aplastic anemia; It can also lead to abnormal menstruation in women and congenital defects in the fetus.
Radon gas
Radon is a colorless, odorless and imperceptible inert gas. Building materials such as cement, brick sand, marble and ceramic tiles are the main sources of radon, and a large amount of radon will also be released in geological fault zones. Radon and its daughters enter the human body with air, or attach to tracheal mucosa and lung surface, or dissolve in body fluids and enter cell tissues, forming internal irradiation, which induces lung cancer, leukemia and respiratory diseases. Research by the World Health Organization shows that radon is the second largest carcinogen of lung cancer after smoking.
ammonia
Ammonia is a colorless gas with a strong pungent smell. It mainly comes from additives such as concrete antifreeze and flame retardant in fire protection board. It has a strong stimulating effect on eyes, throat and upper respiratory tract, and can cause poisoning through skin and respiratory tract. Light can cause congestion, increased secretion, pulmonary edema, bronchitis and dermatitis, and severe can cause laryngeal edema and laryngeal spasm, and can also cause dyspnea, coma and shock. High levels of ammonia can even cause reflex respiratory arrest.
TVOC
As a heterogeneous pollutant in indoor air, volatile organic compounds (VOC) are generally not represented one by one because of their low concentration but various types, and their total amount is represented by TVOC. TVOC includes formaldehyde, benzene, p (m) (o) xylene, styrene, ethylbenzene, butyl acetate, trichloroethylene, chloroform and undecane. Indoor building and decoration materials are the main sources of TVOC in the air. The research shows that even if the content of single VOC in indoor air is lower than its limit, the mixed existence and interaction of multiple VOCs will increase the hazard intensity. TVOC is toxic and irritating, which can cause the imbalance of immune level, affect the function of central nervous system, appear dizziness, headache, lethargy, fatigue, chest tightness and other symptoms, and may also affect the digestive system, such as loss of appetite, nausea, and even cause death in severe cases.