ABSTRACT
In current scenario, pollution in environment, is a big problem for all living species at around the world. We know that, Volatile Organic Compounds (VOCs) in presence of sunlight and oxides of nitrogen in atmosphere are considered as precursors for ozone production at the layer of Troposphere. Concentration of Benzene and Toluene (BT) in ambient air was measured near three major traffic sites in the city of Aligarh, India. All air samples were collected using for two times (in a month) during eight hours of normal working period time for in October – December 2020, and January - March 2021. The three selected sites used in this study represent traffic sites ( at Etah Chungi Chauraha, Quarsi Chauraha and Sootmil Chauraha, Aligarh ). In this study, real-time measurements of Benzene and Toluene concentration were performed the programmable compound specific PID detector designed to provide instantaneous exposure monitoring of a specific organic gas. It monitors a specific gas by utilizing a gas separation tube and the photo-ionization detector (PID) with a 9.8 eV gas discharge lamp (range- 50 ppb to 200 ppb) and whole data analyzed by SPSS software. The study the higher concentration 25.32 ?g/m3 of Benzene in the evening shows at site 3 and lower concentration 10.22 ?g/m3 of Benzene shows at site 2 in the morning. The higher concentration 22.22 ?g/m3 in the evening of Toluene shows at site 1 and lower concentration 07.10 ?g/m3 in the evening of Toluene shows at site 2, were observed respectively. Benzene and Toluene were widely used as a solvent in different products and petroleum. Exposure to a mixture of toluene and benzene in air led to an increase in the cytotoxic effect and DNA damage without any further repair and also its chronic effect on human health. The higher concentration of benzene and toluene co-exposure of benzene or toluene in this study. The relevance of these data on interactions for humans exposed at low benzene concentrations can be best assessed only when the mechanism of interaction is understood at a quantitative level and incorporated within a biologically based modelling framework for human health.
ABSTRACT
Objective To investigate the effects of immune system and immuno-related miRNAs expression in low-dose benzene and its homologue mixed-exposed workers in a short time. Methods A total of 40 workers were recruited from a petrochemical factory ,and their blood samples were collected before and after work to detect the levels of IgA,IgG,IgM,IFN-γ,IL-1β,IL-2,IL-8,TNF-αin serum and miRNA-146a,-155 expression in the peripheral blood mononuclear cell. In the meanwhile ,we measured the individual benzene and its homologue exposure level of recruited workers. Results According to the concentration of benzene ,the subjects were divided into benzene-exposed group(20 workers)and control group(20 workers). And toluene exposure level in benzene-exposed group was significantly higher than that in control group(P<0.05). Significant decrease of IgG was found in benzene-exposed workers after one work shift,compared with control group(P<0.05). Moreover,the interaction between benzene and toluene was significant correlated with the decrease of IL-1β and TNF-α(P < 0.05). Additionally,the interaction between miRNA-155 and miRNA-146a was significant correlated with the decrease of TNF-α(P<0.05). Conclusions:Occupational exposure to low-dose benzene and toluene in a short time could decrease immune function. And there may be an effect of miRNAs in the regulation of cytokine.