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Sinha, Vinayak
- Massive Emissions of Carcinogenic Benzenoids from Paddy Residue Burning in North India
Abstract Views :177 |
PDF Views:67
Authors
Affiliations
1 Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S. Nagar, Manauli PO, Mohali 140 306, IN
1 Indian Institute of Science Education and Research Mohali, Sector 81, S.A.S. Nagar, Manauli PO, Mohali 140 306, IN
Source
Current Science, Vol 104, No 12 (2013), Pagination: 1703-1709Abstract
Benzenoids are organic pollutants emitted mainly by traffic and industrial sources. Here, using a combination of on-line in situ PTR-MS measurements of several benzenoids and methyl cyanide (a biomassburning tracer), satellite remote sensing data of fire counts and back trajectory of air masses at a site in Mohali, we show that massive amounts of benzenoids are released from post-harvest paddy residue burning. Two periods, one that was not influenced by paddy residue burning (period 1, 18 : 00-03 : 30 IST; 5-6 October 2012) and another which was strongly influenced by paddy residue burning (period 2, 18 : 00- 03 : 30 IST; 3-4 November 2012) were chosen to assess normal and perturbed levels. Peak values of 3830 ppb CO, 100 ppb NOx, 40 ppb toluene, 16 ppb benzene, 24 ppb for sum of all C-8 benzenoids and 13 ppb for sum of all C-9 benzenoids were observed during period 2 (number of measurements in period 2 = 570) with the average enhancements in benzenoid levels being more than 300%. The ozone formation potential of benzenoids matched that of CO, with both contributing 5 ppb/h each. Such high levels of benzenoids for 1-2 months in a year aggravate smog events and can enhance cancer risks in northwestern India.Keywords
Atmospheric Chemistry, Benzene, Cancer, Methyl Cyanide.Full Text
- Paul Josef Crutzen (1933–2021)
Abstract Views :209 |
PDF Views:64
Authors
Affiliations
1 Indian Institute of Science Education and Research Mohali, Mohali 140 306, IN
1 Indian Institute of Science Education and Research Mohali, Mohali 140 306, IN
Source
Current Science, Vol 120, No 6 (2021), Pagination: 1102-1106Abstract
No Abstract.Full Text
References
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- Defining the ‘Urban Critical Zone’ for Global Sustainable Development
Abstract Views :57 |
PDF Views:45
Authors
Arkaprabha Sarkar
1,
Vicky Shankar
1,
Vimal Singh
1,
Iain Stewart
2,
Shashank Shekhar
1,
Vinayak Sinha
3
Affiliations
1 Department of Geology, Center of Advanced Studies, Chhatra Marg, University of Delhi, Delhi 110 007, IN
2 Royal Scientific Society, Amman 11941, Jordan, IN
3 Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research, Knowledge City, Sector 81, SAS Nagar, Manauli PO 140 306, IN
1 Department of Geology, Center of Advanced Studies, Chhatra Marg, University of Delhi, Delhi 110 007, IN
2 Royal Scientific Society, Amman 11941, Jordan, IN
3 Department of Earth and Environmental Sciences, Indian Institute of Science Education and Research, Knowledge City, Sector 81, SAS Nagar, Manauli PO 140 306, IN
Source
Current Science, Vol 125, No 8 (2023), Pagination: 824-830Abstract
With urbanization, cities are becoming new landscapes, significantly altering the properties, processes and pathways of previous natural environments. The natural critical zones that have existed for millennia are rapidly getting modified by the superimposition of the urban components to give rise to a new critical zone system, viz. the urban critical zone. The clogging and bypassing of the natural process pathways and the increasing demands of urban populations for ecosystem services put the native critical zone and the adjoining zones under stress. To elucidate this point, we present a case study on Delhi, the capital city of India, to demonstrate how the urban critical zone is unsustainable. We exemplify the increasing demand and supply gap of basic ecosystem services, such as clean air and water, that are essential to sustain life. In doing so, we redefine the limits of the critical zone in urban areas, recognizing that significant parts of cities are beyond the presently defined critical zone.Keywords
Ecosystem Services, Natural Environments, Planetary Boundary Layer, Sustainable Development, Urban Critical Zone.Full Text
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