« Previous AbstractVolatile organic compounds of lung cancer and possible biochemical pathways    Next Abstract"The Schizosaccharomyces pombe mra1 gene, which is required for cell growth and mating, can suppress the mating inefficiency caused by a deficit in the Ras1 activity" »

Sci Total Environ

Title:		Volatile organic compound measurements point to fog-induced biomass burning feedback to air quality in the megacity of Delhi
Author(s):		Hakkim H; Sinha V; Chandra BP; Kumar A; Mishra AK; Sinha B; Sharma G; Pawar H; Sohpaul B; Ghude SD; Pithani P; Kulkarni R; Jenamani RK; Rajeevan M;
Address:		"Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S. Nagar, Manauli PO, Punjab, 140306, India. Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S. Nagar, Manauli PO, Punjab, 140306, India. Electronic address: vsinha@iisermohali.ac.in. Indian Institute of Tropical Meteorology, Pashan, Pune 411008, India. Indian Institute of Tropical Meteorology, Pashan, Pune 411008, India; Savitribai Phule Pune University, Pune, India. Indian Meteorological Department, New Delhi 110003, India. Ministry of Earth Sciences, Government of India, New Delhi 110003, India"
Journal Title:		Sci Total Environ
Year:		2019
Volume:		20190627
Issue:
Page Number:		295 - 304
DOI:		10.1016/j.scitotenv.2019.06.438
ISSN/ISBN:		1879-1026 (Electronic) 0048-9697 (Linking)
Abstract:		"We report the first ambient measurements of thirteen VOCs for investigations of emissions and air quality during fog and non-fog wintertime conditions at a tower site (28.57 degrees N, 77.11 degrees E, 220?ª+m amsl) in the megacity of Delhi. Measurements of acetonitrile (biomass burning (BB) tracer), isoprene (biogenic emission tracer in daytime), toluene (a traffic exhaust tracer) and benzene (emitted from BB and traffic), together with soluble and reactive oxygenated VOCs such as methanol, acetone and acetaldehyde were performed during the winters of 2015-16 and 2016-17, using proton transfer reaction mass spectrometry. Remarkably, ambient VOC composition changes during fog were not governed by solubility. Acetaldehyde, toluene, sum of C8-aromatics (e.g. xylenes), sum of C9-aromatics (e.g. trimethyl benzenes) decreased by >/=30% (>95% confidence interval), whereas acetonitrile and benzene showed significant increases by 20% (>70% confidence interval), even after accounting for boundary layer dilution. During fog, the lower temperatures appeared to induce an emissions feedback from enhanced open BB within Delhi for warming, releasing both gaseous and aerosol pollutants with consequences for fog chemistry, sustenance and intensity. The potential feedback is important to consider for improving current emission parametrizations in models used for predicting air quality and fog in such atmospheric environments"
Keywords:		Air Pollutants/*analysis Air Pollution/*analysis Biomass Cities *Environmental Monitoring *Fires India Seasons Volatile Organic Compounds/*analysis Weather Biomass burning Delhi air quality Fog Proton transfer reaction mass spectrometry Volatile organic c;
Notes:		"MedlineHakkim, H Sinha, V Chandra, B P Kumar, A Mishra, A K Sinha, B Sharma, G Pawar, H Sohpaul, B Ghude, Sachin D Pithani, P Kulkarni, R Jenamani, R K Rajeevan, M eng Netherlands 2019/07/06 Sci Total Environ. 2019 Nov 1; 689:295-304. doi: 10.1016/j.scitotenv.2019.06.438. Epub 2019 Jun 27"