The studies on environmental cadmium (Cd), lead (Pb), arsenic (As) pollution and health impact on exposure population in China were reviewed in the present paper. The related reports said the main pollution sources of serious environmental Cd, Pb and As pollution in China were mining and smelting of nonferrous metals, these pollutants were discharged into the environment and caused the pollution of water, atmosphere, soil and biological species and caused a series of acute and chronic diseases in the exposed people, but the relationship between malignant tumors and environmental cadmium, lead, arsenic pollution is not well understood up to now. The researches should focus on the assessment of environmental pollution and health impact through the effect identification, dose-effect assessment, exposure evaluation and description of risk characteristic.

The indoor air formaldehyde pollution has some adverse effects on human health. A number of researches have been reported on appropriate fitment and other measures to reduce the harm of indoor air formaldehyde pollution. The research progress of pollution control measures and the adverse effect of formaldehyde on human health were reviewed in the present paper.

Objective To know the drinking water safety for students and teachers in urban and rural boarding schools in Guangxi, further to prevent and control the water-borne diseases. Methods The random stratified cluster sampling method was used to select 100 schools in 10 counties of Nanning, Liuzhou and Guilin cities. The drinking water samples were collected and tested according to Sanitary Standard for Drinking Water Quality2001. The epidemic situation of intestinal infectious diseases was investigated. Results The total qualified rate of drinking water quality in 100 boarding schools of 10 counties cities was only 27.00%, as for the water supply provided for themselves with disinfection, the qualified rate was 47.37%, without disinfection, it was 16.95%. 24 outbreak events of intestinal infectious diseases occured in 100 boarding schools in 2000-2005, 2 339 of school teachers and students were attacked, including 13 outbreak events of typhoid and paratyphoid 54.17% with 1 280 cases 54.72%, 6 outbreak events of bacterial dysentery25.00% with 829 cases35.44%, 4 outbreak events of infectious diarrhea 16.67% with 225 cases 9.62%, 1 outbreak of hepatitis A 4.17% with 5 cases 0.21%. These 24 epidemic events were caused by drinking water, the morbidity was higher in the schools where there was no disinfection facility in water supply. Conclusion Some of water supply for some urban and rural boarding schools have been polluted with bacteria in Guangxi, so drinking water disinfection should be done to ensure water safety and prevent the related diseases in these schools.

Objective To explore the relationship of metabolic syndrome(MS)with body mass index(BMI)and waist circumference(WC)in residents of urban and rural in Guangxi.Methods According to the method of multistage stratified randomized cluster sampling confirmed in ″The Nutrition and Health Status of the Chinese People,2002″,2 970 urban and rural people(aged ≥18 years)were selected from 4 cities and 4 countries in Guangxi and their body height,weight,waist circumference and laboratory tests were investigated.Results The prevalence rate of MS was 3.77%,and the urban rate(5.56%)was higher than that of the rural(2.05%),male's rate(4.99%)was higher than female's(2.68%).The prevalence rates of MS in groups with BMI

Objective To explore the relationship between nutrients intake and the prevalence of metabolic syndrome(MS) in urban and rural residents in Guangxi.Methods 3026 people aged 18 years and above were sampled at random from 4 cities and 4 countries in Guangxi with a multistage stratified sampling.All subjects took the diet investigation with 24-hours review method,medical examination and blood assay.Results 107 subjects(3.54%) suffered from MS,and the prevalence rate in city(5.21%) was significantly higher than that in countryside(1.90%,P

Objective To know the current status of the household lavatories in the countryside of Guangxi Province, China and to present the scientific data for the government to make decision in the lavatory improvement in the countryside. Methods A stratified cluster sampling was used in the investigation and 2 414 peasant households in 241 villages were selected in 2006. Results The popularization rate of sanitary lavatory was 43.79% and 50.95% of the peasant households used the non-sanitary lavatory, 5.26% had no household lavatory. The main types of the sanitary lavatories used in the investigated area were firedamp tank-like and three-case-cesspool, accounted for 50.14% and 33.96% respectively. The rate of dejecta treatment for the non-sanitary lavatories was only 13.74%. As the money spent on the sanitary lavatory in each household was no less than 810 Yuan (RMB), maybe the popularization rate of the sanitary household lavatory could reach 50%. Conclusion Although the popularization rate of sanitary household lavatory in the countryside of Guangxi province significantly increased in recent years, it still does not fulfill the requirement for controlling the intestinal infectious diseases and parasitism in this area.

Objective To explore the sanitation of centralized drinking water supply in rural area of Guangxi. Methods 400 centralized drinking water supply systems in 33 counties (district) in rural area of Guangxi had been randomly investigated. The field survey on each monitoring site was carried out by investigation form. The water sampling from distribution system and determination were carried out based on the related national standards. Results The rural centralized water supply facility covered 1 170 147 people in this survey. The national and non-national debt project on rural water supply system accounted for 100 and 300 respectively. The rural centralized water supply system with fully and partially treatment (coagulation, deposition, filtration or disinfection) accounted for 48.00%, and those with the fully treatment accounted for 16.00%. The rural centralized water supply systems of national debt projects with fully and partially treatment (coagulation, deposition, filtration or disinfection) accounted for 33.00%, which is statistically higher than those (10.33%) of non-national debt project. The ratio of the rural centralized water supply systems with fully and partially treatment between national and non-national debt project revealed statistically significant difference (P

Objective To know rural drinking water safety and the affecting factors in Guangxi Zhuang Autonomous Region.Methods The survey was conducted through a combination of census and spot-checks during January to May 2005,taking villages as the survey units,the basic situation of water supply,coverage of tap water,running of water supply facilities,and the distribution and types of water sources,pollution of water sources,water sources and beneficiary population were investigated.The water samples were collected and tested with related standard methods on July and November,2005.Results The total rural population in Guangxi Zhuang Autonomous Region was 41.424 0 million,13.858 1 million people were served with central water supply,accounted for 33.45%.There were 14 260 township and village level central water supply systems.Of these systems,only 1 157 had water purification facilities,accounted for 8.11%.A total of 475 water samples were tested,the eligible was 25.68%.The eligible rates were 23.71% and 27.57% in rainy and dry seasons,respectively.The bacteriological indexes were the main noneligible indexes,as for total coliform,the eligible rate was less than 40%.The rural population consuming unsafe drinking water was 17.768 6 million,accounted for 42.9%.Conclusion The drinking water safety in rural areas in Guangxi Zhuang Autonomous Region is to be solved urgently.Special focus should be paid to the construction and management of rural drinking water safety projects.

Objective To know the drinking water quality,latrine improvement and fecal,domestic garbage,sewage treatment in the rural areas in Guangxi Province.Methods The survey was carried out according to "National Scheme on Current Situation of Rural Drinking Water and Sanitation" from July to December,2006.The water samples were collected in rain season(August 2006).2 414 houses were investigated in 241 administrative villages of 23 counties.Results In the rural population,31.66% was served by central supply,68.34% was served by non-central supply in Guangxi Province.22.22% of the people used surface water and 77.78% used ground water.The eligible rate of water quality was 21.58%.As for surface water,the eligible rate was 32.76%,as for ground water,it was 18.03%.As for central water supply,the eligible rate was 24.06%,as for non-central water supply,it was 18.52%.The eligible rate of total count of bacteria and total coliform was only 62.24% and 29.88% respectively.The sanitary latrine rate was only 43.79%.The treatment rate of domestic garbage was 45.57%,industrial garbage was 80.17%.No domestic sewage was treated,the treatment rate of production wastewater was very low(only 1.59%).Conclusion The drinking water quality and sanitation in the rural areas in Guangxi Province should be improved as early as possible.

Objective To understand and master the dynamic changes and contributing factors to Guangxi rural drinking water quality. Methods No less than 25% of counties in Guangxi Zhuang Autonomous Region were randomly selected according to the proportional stratified sampling method to build the monitoring network for the dynamic monitoring of rural drinking water quality. The sampling time was arranged in the rainy (July or August) and dry season (March or November) in 2007 and 2008, respectively. The test methods were those documented in the standard (GB 5750-2006). Results The coverage rate of rural centralized water supply was 35.72% in 2008, higher than that in 2007 (31.80%) by 3.92%; the eligible rate of water quality in 2007 and 2008 were 20.57% and 24.59% respectively. The eligible rate of water quality in dry season was higher compared with that in the rainy season. Among all the monitoring indexes, the microbiological index ranked the lowest in terms of eligible rate, ranging from 34.76% to 80.68% for central water systems, and from 21.43% to 66.57% for non-central water supply. Conclusion Microbiological pollution is the main influencing factor for drinking water quality in rural areas in Guangxi Zhuang Autonomous Region.