Measurements of CO and NO(sub 2) in the air were carried out on 2 road stretches at Lyngby and Aalborg in Denmark, and detailed traffic counts were undertaken. Air pollution - based on actual traffic conditions was determined using The Nordic calculation method, and calculated results were then compared with the measured values. The Nordic method calculates on 3 levels. On level 1, the only requiarement is information on the annual daily traffic. On level 2 information on speed and type of road is also required. On level 3, additional traffic information for rush hour traffic, such as the amount and distribution of traffic distributed in direction and/or lanes, the number of vehicles running on diesel, the number of heavy vehicles distributed in 3 weight groups, average speed for each stream of traffic and the number of so-called ''cold starting'' cars in each traffic stream (cars that have driven less than 6 minutes) is required. A method was developed and tested to count the traffic, so that at Lyngby and Aalborg, calculations of the air pollution can be made on the basis of level 3. It was shown that the calculated levels of air pollution are generally higher than the levels measured. This may be because measurements have been made during March/April and May/June, which can be expected to give lower values than if the measurements had been made throughout the winter, when the greatest levels of air pollution usually occur. In the calculation model, it is stated that there is an uncertainty of +- 45% for NO(sub 2) and +- 30% for CO. The differences obtained between the measurements and the calculations are thus all within the intervals of uncertainty. (AB) 13 refs.


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    Title :

    Luftforurening fra vejtrafik. 2 eksempler fra Lyngby og Aalborg. (Air pollution caused by road vehicles. Two examples from Lyngby and Aalborg)


    Contributors:
    H. Bendtsen (author)

    Publication date :

    1989


    Size :

    102 pages


    Type of media :

    Report


    Type of material :

    No indication


    Language :

    English





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