| Title: | Investigation of emission characteristics of NMVOCs over urban site of western India |
| Author(s): | Yadav R; Sahu LK; Tripathi N; Pal D; Beig G; Jaaffrey SNA; |
| Address: | "Space and Atmospheric Science Division, Physical Research Laboratory, Ahmedabad, India; Department of Environmental Science and Engineering, Fudan University, Shanghai, China. Electronic address: yadavravi38@gmail.com. Space and Atmospheric Science Division, Physical Research Laboratory, Ahmedabad, India. Space and Atmospheric Science Division, Physical Research Laboratory, Ahmedabad, India; Indian Institute of Technology Gandhinagar Palaj, Gandhinagar, India. Space and Atmospheric Science Division, Physical Research Laboratory, Ahmedabad, India; McGill University, Montreal, Quebec, Canada. Indian Institute of Tropical Meteorology, Pune, India. Mohanlal Sukhadia University, Udaipur, India" |
| DOI: | 10.1016/j.envpol.2019.05.089 |
| ISSN/ISBN: | 1873-6424 (Electronic) 0269-7491 (Linking) |
| Abstract: | "This is the first study to characterize the variation and emission of C(2)-C(5) non-methane volatile organic compounds (NMVOCs) in a semi-urban site of western India based on measurements during February-December 2015. Anthropogenic NMVOCs show clear seasonal dependence with highest in winter and lowest in monsoon season. Biogenic NMVOCs likes isoprene show highest mixing ratios in the pre-monsoon season. The diurnal variation of NMVOC species can be described by elevated values from night till morning and lower values in the afternoon hours. The elevated levels of NMVOCs during night and early morning hours were caused mainly by weaker winds, temperature inversion and reduced chemical loss. The correlations between NMVOCs, CO and NOx indicate the dominant role of various local emission sources. Use and leakage of liquefied petroleum gas (LPG) contributed to the elevated levels of propane and butanes. Mixing ratios of ethylene, propylene, CO, NOx, etc. show predominant emissions from combustion of fuels in automobiles and industries. The Positive Matrix Factorization (PMF) source apportionments were performed for the seven major emission sectors (i.e. Vehicular exhaust, Mixed industrial emissions, Biomass/Fired brick kilns/Bio-fuel, Petrochem, LPG, Gas evaporation, Biogenic). Emissions from vehicle exhaust and industry-related sources contributed to about 19% and 40% of the NMVOCs, respectively. And the rest (41%) was attributed to the emissions from biogenic sources, LPG, gasoline evaporation and biomass burning. Diurnal and seasonal variations of NMVOCs were controlled by local emissions, meteorology, OH concentrations, long-range transport and planetary boundary layer height. This study provides a good reference for framing environmental policies to improve the air quality in western region of India" |
| Keywords: | Air Pollutants/*analysis Air Pollution/*analysis Alkenes/analysis Butadienes/analysis Environmental Monitoring/*methods Hemiterpenes/analysis India Methane/analysis Seasons Vehicle Emissions/*analysis Volatile Organic Compounds/*analysis Wind Diurnal vari; |
| Notes: | "MedlineYadav, Ravi Sahu, L K Tripathi, Nidhi Pal, D Beig, G Jaaffrey, S N A eng England 2019/06/04 Environ Pollut. 2019 Sep; 252(Pt A):245-255. doi: 10.1016/j.envpol.2019.05.089. Epub 2019 May 18" |
