ISSN (Print) - 0012-9976 | ISSN (Online) - 2349-8846

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Vehicular Pollution Control in Delhi

Delhi's CNG experiment has been hailed as among the few success stories of its kind in recent times. This paper investigates whether the enactment of policy instruments in Delhi affected ambient air quality and whether CNG conversion impinged on the pollution profile. To carry out the analysis, daily ambient air quality data was used from June 1999 to September 2003 from the busiest crossing in Delhi. The results do not indicate an all-round improvement in ambient quality as NOx rose after the conversion, whereas SPM and PM10 showed only a marginal fall; CO was the only parameter that showed a significant decline. But the problem so far has been addressed from a limited perspective and there are in fact three ways to approach it: reduction in emissions per unit of fuel used; fewer vehicle kilometres travelled in total and less fuel use per vehicle kilometre travelled. Unless all three modes are enmeshed, one would not expect the air quality to improve.

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