Roadside Monitoring of Automobile Exhaust Gas Emission Using Tunable Diode Laser Absorption Spectroscopy

Vehicular air pollution affects both urban and town air quality all around the world. Air quality in many developing countries is deteriorating according to (WHO/UNEP 1992) report because these countries lack the resources to invest in emission control. Global air pollution problems have captured public attention, because of stratospheric ozone depletion and global warming. In response to global warming steps to reduce and to stabilize the greenhouse gases were agreed in the 1997 Kyoto Protocol. If the predictions are turning out to be true, then, widespread changes in human activities is required to fend off disastrous consequences. The need for adopting a latest technology based instrument and technique that ensures control of vehicular emission is the need of the hour. At present large and significant uncertainties exists in the estimates of the motor vehicle inventory all around the world. There should be a primary approach to quantify vehicular emissions, which also serves a dual purpose of designing cost-effective control strategies besides detecting vehicular pollution. “Open path tunable diode (infrared) laser detection absorption spectroscopy (TDLAS)” method is a fool-proof method to detect and control vehicular emission. It is both cost-effective and also a sensitive detection method that gives a comprehensive study of a vehicular emission giving various types of emissions such as, NO, CO, CO 2, N 2O, NO 2, NH 3, HC, etc, in a single study and analysis.[1-4].