Environmental Monitoring and Assessment

, Volume 115, Issue 1–3, pp 405–417

Assessment of Air Quality After the Implementation of Compressed Natural Gas (CNG) as Fuel in Public Transport in Delhi, India

  • Khaiwal Ravindra
  • Eric Wauters
  • Sushil K. Tyagi
  • Suman Mor
  • René Van Grieken
Article

Abstract

Public transport in Delhi was amended by the Supreme Court of India to use Compressed Natural Gas (CNG) instead of diesel or petrol. After the implementation of CNG since April 2001, Delhi has the highest fraction of CNG-run public vehicles in the world and most of them were introduced within 20 months. In the present study, the concentrations of various criteria air pollutants (SPM, PM10, CO, SO2 and NOx) and organic pollutants such as benzene, toluene, xylene (BTX) and polycyclic aromatic hydrocarbons (PAHs) were assessed before and after the implementation of CNG. A decreasing trend was found for PAHs, SO2 and CO concentrations, while the NOx level was increased in comparison to those before the implementation of CNG. Further, SPM, PM10, and BTX concentrations showed no significant change after the implementation of CNG. However, the BTX concentration demonstrated a clear relation with the benzene content of gasoline. In addition to the impact of the introduction of CNG the daily variation in PAHs levels was also studied and the PAHs concentrations were observed to be relatively high between 10 pm to 6 am, which gives a proof of a relation with the limited day entry and movement of heavy vehicles in Delhi.

Keywords

CNG public transport CO NOx SO2 PM10 BTX PAHs principal component analysis 

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Copyright information

© Springer Science + Business Media, Inc. 2006

Authors and Affiliations

  • Khaiwal Ravindra
    • 1
  • Eric Wauters
    • 2
  • Sushil K. Tyagi
    • 3
  • Suman Mor
    • 4
  • René Van Grieken
    • 1
  1. 1.Micro and Trace Analysis Center, Department of ChemistryUniversity of AntwerpAntwerpBelgium
  2. 2.Flemish Environment Agency (VMM)GentBelgium
  3. 3.Central Pollution Control BoardDelhiIndia
  4. 4.Centre for Energy StudiesIndian Institute of Technology DelhiNew DelhiIndia

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