The wastewater discharged from industrial "three wastes" contains heavy metal poisons such as lead and cadmium, which can cause chronic cadmium poisoning (pain) and lead poisoning through rice after irrigation; Chronic arsenic poisoning and mercury poisoning caused by pesticide pollution in soil containing arsenic and mercury; After "three wastes" and pesticides pollute the soil, surface water and groundwater are polluted by rainwater, and people can cause poisoning through drinking water, food and livestock feed.
② Inducing cancer
Recent studies have further confirmed that cadmium, phenoxy herbicides and chlorophenol pesticides have carcinogenic effects on people. The soil is contaminated by radioactivity. External irradiation and internal irradiation (through respiratory tract and digestive tract) can not only induce cancer, but also lead to dizziness, fatigue, alopecia and leukopenia or increase.
③ spreading diseases.
Soil polluted by feces, garbage and sewage containing pathogens can become the transmission medium of related diseases, such as typhoid fever, paratyphoid fever, dysentery and tuberculosis. There are also tetanus, gas gangrene, botulinum and so on. It can survive in soil for a long time and become an important source of infection for people infected with these diseases.
(4) the impact of noise on health
Any incongruous sound that interferes with people's normal rest and sleep and affects people's normal work, study, thinking and conversation is noise. China stipulates that the post noise intensity of working 8 hours a day: newly-built enterprises should not exceed 85 decibels, and existing enterprises should be appropriately relaxed to 90 decibels. The main noise sources in daily life and production are:
① Industrial noise: the impact noise and motor roar from various machinery and high-speed equipment in the factory, such as the noise generated by looms, pneumatic tools, smelting equipment, ball mills, forging, chainsaws, mixers and pile drivers on the construction site.
② Traffic noise: It mainly comes from noise generated by various vehicles, trains, planes and ships. During startup and operation.
(3) Living noise: The main sources are noise from bazaars, high-pitched noise from entertainment places, sports venues and propaganda tools, and noise from home tape recorders, televisions, washing machines and sewing machines.
The harm of noise to human health can be reflected in the nervous system, cardiovascular system and digestive system, but the effect on the nervous system is the most direct. Long-term exposure to noise has adverse effects on people's nervous system, mainly manifested in hearing loss; Noise can also cause neurasthenia syndrome such as headache, dizziness, tinnitus, palpitation and sleep disorder; The damage to cardiovascular system is mainly manifested in the acceleration or deceleration of heart rate and unstable blood pressure; Can cause gastrointestinal dysfunction, loss of appetite, emaciation, decreased gastric juice secretion, and slow down gastrointestinal peristalsis of the digestive system.
(5) The influence of social environment on human health.
Social environment has great influence and restriction on people's health. As a group of high school students who are experiencing the process of growth, development and socialization, they are also deeply influenced and restricted by the social environment without exception. There are more than 800,000 primary and secondary schools and 1 1,000 institutions of higher learning in China, with more than 200 million students, accounting for more than 1/5 of the population of China. They not only account for a large proportion of the social population, but more importantly, they represent the future of mankind and the hope of national rejuvenation and national prosperity. Therefore, it is of great and far-reaching significance to study various social factors that affect their healthy growth, especially family environment, school environment, peer groups and socio-political, economic and cultural environment, so as to lay a good foundation for their physical and mental health before entering society.
References:
People's Education Press