Based on research methods such as methods such as data collection and processing, air quality index calculation methods, public health risk assessment methods to assess air quality and effects of substances on the health of people in Di An city. The data for the calculation are inherited from the environmental monitoring report of the Department of Natural Resources and Environment of Di An city in the period of 2019. The calculation results show that the air quality in the city. Di An is fluctuating at an average - poor level (especially in the Cay Lon junction area with the highest index of 150), the health risk assessment results show that when exposed to dust, the total group of people Adults (Women and Men) had a high fluctuating cancer risk index with the highest index of 2 subjects being in the first quarter 0.310, 0.295, in the second quarter 0.269, 0.282, in the third quarter 0.296, 0.282, Fourth quarter 0.289, 0.275. As for other indicators, the subjects assessed when exposed to substances in the air environment in Di An city can be affected to their health, of which the group of adults is still the group of people. Women and men) are the most affected group.

This study aims to assess environmental risk using the improved Nemerow index and the principal component analysis (PCA) method in Long Thanh's Industrial Park in Dong Nai Province. The study was implemented in five industrial parks of Long Thanh District in 2019. The result showed that Loc An - Binh Son industrial park was at extreme high risk of the level (6.7). Three industrial parks of Long Thanh, Go Dau and An Phuoc were high-risk (from 3 to 5) respectively. On the other hand, Long Duc Industrial Park has obtained no environmental risk.

The wastewater treatment plant is an extremely important infrastructure to ensure the quality of life, water use of human life, and other ways to ensure water quality for the natural environment. In the operation of it, there are always potential hazards affecting the health of the workers working in the factory. The study was performed using the Semi-quantitative risk assessment method to calculate the values of operational risks in the water treatment plant (WWP). The results of the study obtained 18 high potential hazards that may lead to the present in the water treatment process. The hazards were the leakage of deodorizing towers and the generation of toxic emissions of dead microorganisms that have the highest value with a risk scale of 20 points- frequent impacts on employees. The study has also identified the dangers present in WWP and this will be the premise for mitigating solutions for problems occurring at its.

Bien Hoa City is an urban area of Dong Nai province located in the Southern key economic region. Currently, Bien Hoa City has 6 industrial parks in operation with large daily wastewater flow, causing environmental risks, especially from organic pollutants. The study applied the Nemerow risk index and the geographic information systems (GIS). The results showed that the industrial parks were mainly organic pollution levels including N-total, P-total, and Ammonium. The level of environmental risk from organic pollution was recorded in range of medium to very high levels, the ranked in descending order: Agtex Long Binh Industrial Park (P = 24)> Amata Industrial Park (P = 16)> Bien Hoa 2 Industrial Park ( P = 10),> Tam Phuoc Industrial Park (P = 5)> Loteco Industrial Park (P = 3). The results of the study provided good information for the management and improvement of wastewater quality in the industrial wastewater treatment plants of the industrial parks in Bien Hoa City.