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| Titel |
Source attribution and mitigation strategies for air pollution in Delhi |
| VerfasserIn |
Gregor Kiesewetter, Pallav Purohit, Wolfgang Schoepp, Jun Liu, Markus Amann, Anil Bhanarkar |
| Konferenz |
EGU General Assembly 2017
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| Medientyp |
Artikel
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| Sprache |
en
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| Digitales Dokument |
PDF |
| Erschienen |
In: GRA - Volume 19 (2017) |
| Datensatznummer |
250152012
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| Publikation (Nr.) |
 EGU/EGU2017-16796.pdf |
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| Zusammenfassung |
| Indian cities, and the megacity of Delhi in particular, have suffered from high air pollution for
years. Recent observations show that ambient concentrations of fine particulate matter
(PM2.5) in Delhi strongly exceed the Indian national ambient air quality standards as well as
the World Health Organization’s interim target levels. At the same time, India is experiencing
strong urbanization, and both Delhi’s emissions as well as the exposed population are
growing. Therefore the question arises how PM2.5 concentrations will evolve in the future,
and how they can be improved efficiently.
In the past, typical responses of the Delhi government to high pollution episodes have
been restrictions on motorized road traffic, on power plant operations and on construction
activities. However, to design sustainable and efficient pollution mitigation measures, the
contribution of different source sectors and spatial scales needs to be quantified. Here we
combine the established emission calculation scheme of the Greenhouse Gas - Air Pollution
Interactions and Synergies (GAINS) model with regional chemistry-transport model
simulations (0.5∘ resolution) as well as local particle dispersion (2 × 2 km resolution) to
arrive at a source attribution of ambient PM2.5 in Delhi. Calculated concentrations compare
well to observations. We find that roughly 60% of total population-weighted PM2.5 originates
from sources outside the national capital territory of Delhi itself. Consequently,
mitigation strategies need to involve neighboring states and address the typical
sources there. We discuss the likely evolution of ambient concentrations under
different scenarios which assume either current emission control legislation, or
application of a Clean Air Scenario foreseeing additional regulations in non-industrial
sectors which are often overlooked, such as phase-out of solid fuel cookstoves,
and road paving. Only in the case where the Clean Air Scenario is applied both in
Delhi as well as in surrounding states, a strong reduction in ambient concentrations
is envisaged which would bring PM2.5 levels close to the WHO interim targets. |
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