An ever-increasing number of genetic overlap research reports have recently been performing threat tests by deciding on bioavailability， adjustment variables， and combined probabilistic models. To improve the accuracy of risk assessment outcomes， using a large As-contaminated web site as a case， 432 sampling internet sites had been set up and gathered at different depths to analyze the amount and distribution characteristics of As air pollution， and probabilistic threat evaluation was conducted because of the adjustment of design parameters through literary works research and Monte Carlo simulation. Then， the impact of old-fashioned methods and probabilistic techniques on wellness threat assessment was explora surpassed appropriate risk amounts 1E-6， with oral ingestion of earth being the principal path of publicity. In addition， the results regarding the susceptibility evaluation associated with parameters indicated that As focus， daily oral ingestion price of soils， and exposure duration of kiddies had reasonably larger impacts for health threats. This work will provide a methodological and theoretical basis for achieving precise threat assessment of As-contaminated internet sites and supply concepts for processed risk management.In purchase to explore the air pollution traits， ecological risks， and pollution sources of heavy metals in farmland grounds around typical industrial facilities in Hunan Province， the content traits of eight heavy metals in farmland grounds around fluoride factories， fabric factories， and plating plants were examined. The geo-accumulation index and prospective ecological danger list were used to judge the pollution and environmental danger of hefty metals. The correlation analysis， hierarchical cluster analysis， and main component evaluation were utilized to evaluate the types of heavy metals. The Monte-Carlo model ended up being used to gauge the probability danger of local environmental threat. The outcomes indicated that the key pollution elements when you look at the earth were Cd and Zn， and their mean values had been 4.46 and 2.73 times the background values， correspondingly. Zn was at a mild pollution degree in the earth associated with the three typical industrial facilities， and Cd is at a moderate pollution level within the entire fluoride factory. The pollution types of hefty metals when you look at the typical industrial facilities had been primarily all-natural sources， commercial task resources （industrial waste discharge， mineral mining， and smelting activities）， traffic sources， etc. The outcome of potential environmental danger assessment revealed that the ecological danger of the fluoride factory is at a higher risk level， and also the ecological risk of the leather-based factory and plating plants is at a higher danger level. Cd had been the main contributing factor. The results of Monte-Carlo probabilistic environmental risk assessment paid off the anxiety of deterministic assessment， which may supply systematic foundation for precise risk management and control within the regions.Quantifying the possibility of soil heavy metal and rock resources can identify the key air pollution resources. It may dilation pathologic provide a scientific basis for reducing the environmental and person health threats of soil hefty metals. Taking the low earth in a Pb-Zn mine watershed in north Guangxi as an investigation object， ecological and peoples health threat tests had been performed using prospective ecological danger assessment （RI） and individual wellness risk assessment （HRA）， and the source apportionment of earth hefty metals ended up being completed using the absolute key component-multiple linear regression receptor （APCS-MLR） model and random woodland （RF） design. Then， a combined risk assessment model， composed of RI， HRA， and APCS-MLR， had been used to quantify the possibility of soil heavy metal resources. The results showed that the items of Pb， Zn， Cu， and Cd exceeded environmentally friendly screening values for agricultural land with mean values of 342.77， 693.34， 61.27， and 3.08 mg·kg-1， respectively， and there was clearly a certain amount of contamination. Pb， Cr， and also as were the key wellness danger impact factors， with higher health problems for children compared to grownups. Three sources were identified： mining activities （Source Ⅰ）， soil parent material sources and original formation （Source Ⅱ）， and unknown resources. Pb， Zn， Cu， and Cd had been primarily produced by Source Ⅰ， and Cr and As had been managed by unidentified resources and supply Ⅱ. The origin risk evaluation outcomes of soil heavy metals suggested that the possibility ecological risk and non-carcinogenic risk were mainly from Source Ⅰ and Source Ⅱ， and carcinogenic danger ended up being primarily from unidentified resources. The unidentified resources had a higher percentage in source apportionment and risk assessment， and should be additional researched to give systematic 8Cyclopentyl1,3dimethylxanthine basis for earth heavy metal control. The combined risk evaluation design according to source analysis， focusing on the chance attributes of different sources， can precisely recognize risky air pollution sources. It is an even more reasonable and reliable risk assessment method.In order to comprehensively study the air pollution faculties of polycyclic aromatic hydrocarbons （PAHs） in soils of Guangzhou， 222 topsoil examples had been gathered and examined.