1 industrial waste, domestic sewage and agricultural production.
A prospective cohort study of chrysotile asbestos workers over a period of 27 years (1972-1999) showed that there were 22 lung cancer deaths in the asbestos exposure cohort (SMR = 652) and 3 lung cancer deaths in the control cohort (SMR = 89). The relative risk of lung cancer in smokers exposed to asbestos was RR = 32, RR = 12 in non-smokers, indicating that asbestos exposure, especially smokers, had a higher risk of dying from lung cancer. The output of vinyl chloride (VCM) in China has increased rapidly and has become a major producer of polyvinyl chloride in the world. The risk of liver cancer among workers exposed to vinyl chloride has been seriously concerned. In 2007, it was found that the micronucleus rate of lymphocytes in workers exposed to vinyl chloride (VCM) was significantly higher than that in the control group, which could affect the expression of DNA damage / repair genes and cell cycle regulatory genes. Due to the rapid development of industrialization and urbanization in China, improper utilization of resources, pollutants emitted in the process of industrial production, fuel combustion, transportation and so on have a serious impact on the atmospheric environment. A large amount of unpurified industrial wastes, domestic sewage and many chemicals and wastes from agricultural production activities are injected into rivers and lakes, seriously polluting water resources.2 tobacco smoke and cooking oil fume.Some of them also enter the soil, not only affecting the growth and development of crops, affecting food safety, but also directly or indirectly endangering people's health. In the living environment, indoor decoration materials such as paints, paints, adhesives, household chemicals and so on will release chemical pollutants such as formaldehyde and benzene series in the process of use. Although the concentration of these pollutants is very low in the room, but most of them are irritating, and some also have genotoxicity, causing certain harm to human health. In addition, tobacco smoke and cooking oil fumes also contain a large number of toxic and harmful pollutants, which can increase the risk of lung cancer. A survey by the World Health Organization found that about 3 billion people around the world still use solid fuel for cooking and heating at home in open fires and open stoves. About 2.7 billion people burn biomass (firewood, animal manure, crop waste) and another 400 million use coal. This method of cooking and heating causes high levels of indoor air pollution and produces a large number of harmful pollutants, including tiny particles of smoke that can penetrate deep into the lungs. In poorly ventilated dwellings, indoor soot levels are 100 times higher than acceptable levels of tiny particles. Since women and young children spend the longest time by the fireside, they are also exposed to particularly serious pollution.
