Nitrogen dioxide (NO2) is one of the main pollutants that affecting the quality of life and human health. Mostly, the effects of NO2 exposure depending on concentration, duration of exposure and anthropometric variables. This study aimed to analyzing the NO2 concentration of ambient air and to assessing human health risks in real time and lifetime exposure. To achieve that goal, air samples were taken at four strategic locations in Kupang City, in which were represented by industrial, roadside, residential, and office areas. The Griess Saltzman method was used for sampling and analysis of NO2 levels. Totally, there were 48 air samples had been analyzed for NO2 levels. The detected NO2 concentration showed a trend varied between sampling locations. Overall, NO2 levels measured still met ambient air quality standards. Human health risk assessment was carried out by determining the intake (I) and Risk Quotient (RQs) in four groups of individuals exposed to NO2. The results shown that the RQs for real time and lifetime exposures were both less than 1.0, in which implying a non-carcinogenic risk of NO2 exposure in the study area. The results Health risk assessment also indicating that potential non-carcinogenic risks occur when NO2 exposure is more than 39 years.
The Dendeng River is vital for economic sustainability and viability for the community, industry and commerce around the flood plain of the river as well as raw water sources of the Kupang PDAM. However, increased domestic and industrial waste disposal along the river has caused severe pollution. One way to maintain the quality of the river is by continuously monitoring the pollutants and applying technology control as well as controlling strategy. The aim of the research mainly is to establish the water quality status of Dendeng River by water pollution Index method based on parameter physics and chemistry, i.e. pH, DO, COD, BOD, TSS, TDS, NH3-N, NO2-N, NO3-N, and PO4-P. The research was carried out based on field survey and sample examined in situ and in laboratory. The removal of water sample from Dendeng River conducted based on composite sampling as many as six point locations of Dendeng River as representative of upstream up to downstream zone. The quality status of Dendeng River is in good condition to lightly polluted with a pollution index value of 0.6 to 1.52. Value of the DO, BOD, COD, and phosphate content were higher than the allowable class 1 standard. The Water Quality Index value of Dendeng River was 86.67, which is included in the good water quality class.
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