| Title: | "Diurnal variation of BTEX at road traffic intersection points in Delhi, India: source, ozone formation potential, and health risk assessment" |
| Author(s): | Mehta D; Hazarika N; Srivastava A; |
| Address: | "School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India. Department of Applied Mechanics, Indian Institute of Technology Delhi, New Delhi, 110016, India. School of Environmental Sciences, Jawaharlal Nehru University, New Delhi, 110067, India. srivastava02@hotmail.com" |
| Journal Title: | Environ Sci Pollut Res Int |
| DOI: | 10.1007/s11356-019-07495-8 |
| ISSN/ISBN: | 1614-7499 (Electronic) 0944-1344 (Linking) |
| Abstract: | "The present study was carried out to observe the variation of volatile organic compounds (VOCs) namely benzene, toluene, ethylbenzene, and xylene isomers (BTEX) at three different sites of Delhi, during 2016-2017. Four hourly sampling was carried out day and night separately. Results showed that BTEX concentration was highest in post-monsoon and lowest in monsoon season. Again, daily variation shows that benzene (47%) and toluene (35%) were more during night than day when it was 44% and 33% respectively. Mean concentration of BTEX was observed in following order: ethylbenzene ~ o-xylene < m,p-xylene < toluene < benzene, while overall seasonal variation was observed as follows: post-monsoon > summer > winter > monsoon. Possible emission sources of BTEX were also established through corresponding ratios of individual compounds. Xylene isomers together accounted highest ozone formation potential. The risk assessments of BTEX were carried out in terms of non-cancer (the hazard quotient, HQ) and cancer (the incremental lifetime cancer risk, ILCR) regarding the inhalation exposure only. It was observed that benzene and xylene isomers possessed higher HQs than ethylbenzene and toluene at all sites throughout the study. Again, benzene was found with higher mean ILCR (3.58 x 10(-5)) than ethylbenzene (1.47 x 10(-5))" |
| Keywords: | Air Pollutants/*analysis Benzene/analysis Benzene Derivatives/analysis Environmental Monitoring India Ozone/*analysis Risk Assessment Toluene/analysis Xylenes/analysis Btex Delhi Health risk assessment Ozone formation potential Traffic intersection points; |
| Notes: | "MedlineMehta, Dudun Hazarika, Naba Srivastava, Arun eng JRF/Council of Scientific and Industrial Research, India/ UPoE/University Grants Commission/ Germany 2020/01/20 Environ Sci Pollut Res Int. 2020 Apr; 27(10):11093-11104. doi: 10.1007/s11356-019-07495-8. Epub 2020 Jan 18" |
