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Speciated PM10 Emission Inventory for Delhi, India

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Volume: 14 | Issue: 5 | Pages: 1515-1526
DOI: 10.4209/aaqr.2013.02.0047
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Prashant Gargava 1,2, Judith C. Chow2,3, John G. Watson2,3, Douglas H. Lowenthal2

  • 1 Central Pollution Control Board, Parivesh Bhawan, East Arjun Nagar, Delhi – 110 032, India
  • 2 Desert Research Institute, 2215 Raggio Parkway, Reno, NV 89512, USA
  • 3 Institute of Earth Environment, Chinese Academy of Sciences, 10 Fenghui South Road, Xi’an High-Tech Zone, Xi’an 710075, China

Abstract

Emission inventories can serve as a basis for air quality management programs. The focus has been mainly on building inventories for criteria pollutants including particulate matter (PM). Control efforts in developing countries are mostly limited to total suspended particles (TSP) and/or PM10. Since the adverse effects of PM10 depend on its chemical composition, it is important to control emissions of toxic species. The first step is to identify key pollution sources and estimate quantities of various chemical species in emissions. This paper presents a speciated PM10 emission inventory for Delhi, the capital and one of the most polluted cities in India. An established PM10 inventory for Delhi in conjunction with source profiles was used to estimate emissions of major PM10 components including organic and elemental carbon (OC and EC, respectively), sulphates (SO42–), and nitrates (NO3), as well as selected toxic trace metals (i.e., Pb, Ni, V, As, and Hg), some of which are subject to India’s National Ambient Air Quality Standards (NAAQS). For the base year of 2007, emission estimates for PM10 mass, OC, EC, SO42–, and NO3 are 140, 22, 6.4, 2.8, and 2.1 tonnes/day (TPD; 1 tonne = 1000 kg), respectively. Emissions of Pb, Ni, V, As, and Hg are estimated to be 203, 43, 37, 26, and 9.4 kg/day, respectively. This inventory underestimated Pb and Hg emissions because sources of PM10 from unorganized secondary lead smelters are not specifically identified and gas-to-particle conversion of Hg is not accounted for.

Keywords

Emission inventory Delhi Speciated PM10


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