Majumdar, Deepanjan and Gavane, Ashok Gangadhar (2020) Diurnal-, Seasonal- and Site-Dependent Variability in Ground-level Total Non-Methane Hydrocarbon in Nagpur City of Central India. Asian Journal of Atmospheric Environment, 14 (1). pp. 1-13. ISSN 1976-6912 (P) 2287-1160 (E)

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Temporal & spatial variations in ground-level total non-methane hydrocarbon (TNMHC) were studied in Nagpur urban agglomeration (UA) for a year over three seasons viz. post-monsoon (September-October), winter (January-February) and summer (May-June) in 2013-14. Ground-level TNMHC showed low to moderate spatial (over residential, commercial, traffic intersections, residential cum commercial sites) and temporal (at 7:00, 13:00; 18:00 and 23:00 h in all three seasons) variations. There was no specific increasing or decreasing trend with time, either within a day or a season. Daily mean concentration of TNMHC (averaged over concentrations at 7:00, 13:00; 18:00 and 23:00 h) ranged from 0.88-1.73 ppmV, 1.75-4.04 ppmV and 1.20-1.53 ppmV at residential sites; 2.99-6.47 ppmV, 1.52-7.38 ppmV and 0.98-1.63 ppmV at traffic site; 0.83-1.15 ppmV, 2.03- 3.24 ppmV, 1.1-1.70 ppmV at residential cum commercial sites and 1.05-4.79 ppmV, 6.2- 8.58 ppmV, 0.34-0.64 ppmV at the purely commercial site, during post-monsoon, winter and summer, respectively. Occasional spikes (TNMHC>10 to <13.6 ppmV) were observed on three occasions over two sites in winter but reasons thereof remained unidentified. During Diwali Festival (in post-monsoon) marked by large-scale firecrackers bursting, observed TNMHC concentrations hovered around 3-5 ppmV, which almost matched with 90th percentile of other post-monsoon concentrations. Highest mean seasonal TNMHC concentration was observed during winter, followed by means of post monsoon and summer seasons while mean ground-level TNMHC concentrations on weekdays were slightly higher (1.17-1.21 times) than weekends over all seasons.

Item Type: Article
Uncontrolled Keywords: Air Pollution; NMHC; Urban; VOC; Weekend
Subjects: Air Quality
Air Pollution
Air Pollution Control
Depositing User: Mr. RK Lohiya
Date Deposited: 21 Jan 2021 04:51
Last Modified: 21 Jan 2021 04:51

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