Air Quality Assessment in Delhi: Before and After CNG as Fuel |
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Authors: | Asha B Chelani Sukumar Devotta |
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Institution: | (1) National Environmental Engineering Research Institute, Nehru Marg, Nagpur, 440 020, India |
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Abstract: | A number of policy measures have been activated in India in order to control the levels of air pollutants such as particulate
matter, sulphur dioxide (SO2) and nitrogen dioxide (NO2). Delhi, which is one of the most polluted cities in the world, is also going through the implementation phase of the control
policies. Ambient air quality data monitored during 2000 to 2003, at 10 sites in Delhi, were analyzed to assess the impact
of implementation of these measures, specifically fuel change in vehicles. This paper presents the impact of policy measures
on ambient air quality levels and also the source apportionment. CO and NO2 concentration levels in ambient air are found to be associated with the mobile sources. The temporal variation of air quality
data shows the significant effect of shift to CNG (Compressed Natural Gas) in vehicles. |
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Keywords: | Air quality Vehicular emission CNG Control policies |
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