Survey of vehicle emissions in Israel related to vehicle age and periodic inspection

The vehicle age distribution and time from the last inspection are important considerations when evaluating the effects of exhaust emissions. A survey of CO and HC emissions from a sample of 600 cars was carried out in order to assess the influence of the aforementioned factors on emission levels. The survey was conducted under two conditions: idle and fast idle (a rotary speed of 3000 rpm). The variation of CO and HC emissions with vehicle age, time elapsed since last annual test, and engine capacity were revealed. The results were analyzed for both test conditions. Appropriate functions relating emission levels with the vehicle parameters were obtained. The main findings of the study are as follows: