Abstract
An Intervention Analysis Model (IAM) (Box and Tiao, 1975) was developed to study the impact of the `intervention' brought in by the Government of India (GoI), to control the CO pollution caused by the vehicular exhaust emissions, by the enforcement of the emission standards for the vehicles, on the mean level of the time-series of CO concentration. The study was conducted for an Air Quality Control Region (AQCR) comprising of an urban road intersection in Delhi, India, where almost 100% CO is contributed by vehicular traffic. Application of the model suggests that the `intervention' has not been effective in bringing down the desired change; some likely causes of which have also been mentioned.
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