Relevant data show that the indoor pollution index is much higher than the outdoor control point. For example, the indoor total suspended particulate matter (TSP) is 1.3 ~ 9 times that of outdoor, which is far higher than the maximum allowable concentration in residential areas. In coal-fired households, the daily average indoor concentration of SO is 7 ~ 5 1 1 times the allowable concentration; No indoor, the concentration is 2 1 ~ 37.5 times of the allowable concentration; The daily average concentration of indoor co is 4 ~ 8 times of the allowable concentration. The improvement of kitchen energy structure, opening more windows and installing exhaust devices are important conditions for improving indoor environment.
At present, home decoration is becoming more and more high-grade and exquisite, but it also brings more and more pollution. At present, the most harmful building decoration materials mainly come from three aspects: 1. Radon contained in cement and sand, radioactive substances contained in slag brick; 2. Formaldehyde in the board and paint in the decoration materials; 3. Formaldehyde released by furniture and benzene pollution caused by glue spraying on fabric sofa. Some people think that there are more than 300 kinds of volatile organic compounds in decoration materials, among which formaldehyde, VOC (benzene and homologues), ammonia, radon and radioactive substances are the most common and harmful. Long-term exposure to high concentrations of radon and other radiation can lead to lung cancer, leukemia and respiratory diseases. The initial reactions of human body to formaldehyde are vomiting, diarrhea, tears and fatigue. When the formaldehyde concentration reaches 0.06 ~ 0.67 mg/m3, children will have asthma. Formaldehyde also causes cancer. For example, a hospital in Beijing found that in the past six months, most children's homes have been decorated, and most of them are luxurious and have high formaldehyde content.