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Berlin Environmental Atlas

03.09 Traffic-related Air Pollution - Hydrocarbons

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Overview

Basic Situation

Berlin has been confronted with a considerable increase in motor traffic since the reunification of Germany. The number of motor vehicles registered in Berlin has risen about 30 % since 1989 to a present total of 1,280,000. A further growth in motor vehicle traffic is projected for the future, especially for heavily polluting freight transport.

These changes are not yet concluded. Traffic increases result from the expansion of the Berlin/Brandenburg residential and economic area; from the rapid growth of international economic relations; and particularly from the strengthening of links between Berlin and Eastern Europe.

Motor vehicle traffic has become the greatest cause of air pollution in Berlin. The most significant pollutants emitted by motor vehicles in terms of quantity are carbon monoxide, hydrocarbons, nitrogen oxide and carbon dioxide. The pollutant quantities of diesel particulates, tire abrasion and benzol are much smaller, but they are important because of their effects.

Motor vehicle pollution is especially high in the inner city, where over 1 million people inhabit an area of 100 sq km. The future functions of the inner city will clearly increase traffic and air pollution in this area.

The map shows spatial distributions of hydrocarbon emissions. Hydrocarbons (HC) were selected since they, along with nitrogen oxide, play a significant role as ozone precursors. Other hydrocarbons, e.g. benzol, require particular attention because of their carcinogenic effects (Hydrocarbons and ozone-building processes are treated in Map 03.06 SenStadtUmTech 1996).

Map 03.10, Traffic-related Air Pollution - Benzol, Nitrogen Oxide and Diesel Particulates (SenStadtUmTech 1998), describes air pollution of these three substances in Berlin. Both maps are based on emission and dispersal simulation models which are comparably constructed in methodology and which are grounded upon the same statistical base.

Causes and Amounts of Traffic-related Hydrocarbon Emissions

Hydrocarbons are released through the exhaust when fuel is unburned or incompletely burned. Considerable amounts also reach the atmosphere due to fuel evaporation. Hydrocarbons evaporate from the fuel tank and other fuel feed elements, such as the fuel line, carburetor, filter, reserve canister, etc.. Hydrocarbons also vaporize when fuel station storage depots and motor vehicle tanks are filled.

Figure 1 shows the development of motor vehicle hydrocarbon emissions in Berlin since the beginning of the 80s. A projection for the year 2000 is included. The fundamental restructuring of calculation methodology means that only limited comparisons can be made to previous emission investigations based on much simpler methods. Motor vehicle evaporative emissions were included only after 1985.

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Fig. 1: Hydrocarbon Emissions of Berlin Motor Vehicle Traffic in Tons per Year

Emission data for 1989 show that hydrocarbon emissions in East Berlin were almost as high as in West Berlin, even though East Berlin has less than half the population, and far fewer motor vehicles. Causes of high hydrocarbon emissions in East Berlin were 1) motor vehicles with two-stroke engines (Trabbis, the East German peoples' auto) driven only in East Berlin until 1989, and 2) fuel quality. Hydrocarbon emissions decreased around 30 % from 1989 to 1996. This development is due to changes in the types of motor vehicles in East Berlin; general technical improvements in engines, including the wider use of catalytic converters for autos and improved fuel quality.

Table 1 gives information for 1993 according to vehicle types. This information is: the total travelled distances of motor traffic in millions of vehicle kilometers per year (km/a) within the urban area of Berlin; fuel consumption in tons (t); and exhaust and abrasion emissions from motor traffic in tons per year (t/a). Motorized two-wheel vehicles and evaporative emissions are not included here since they cannot be assigned to types of streets.

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Tab. 1: Total Travelled Distances in Millions of Vehicle km/a; Fuel Consumption in Tons, t; and Exhaust and Abrasion Emissions in Tons per Year, t/a. These Figures are Presented according to Vehicle Types in the Urban Area of Berlin in 1993. Excluded are Motorized Two-wheel Vehicles and Evaporative Emissions (Liwicki, Garben 1993)

Excel
[Table is also available as Excel-File (MS-Excel is required).]

The trends above indicate a worsening of the situation for some pollutants and no significant reductions for other pollutants (see Map 03.10 SenStadtUmTech 1998). This is particulary so for nitrogen oxides and (diesel) particulates. (Diesel) particulates have the greatest current need for action. Hydrocarbon emissions, however, are expected to decline significantly even without regulatory intervention because 1) more vehicles are being equipped with 3-way catalytic converters and 2) fuel quality is improving. Technical improvements for passenger cars have had significant effects. The situation for diesel particulates is different. Trucks and buses make up 5 % of total travelled distances and are responsible for 10 % of total emissions - but they are responsible for 90 % of carcinogenic diesel particulate emissions.

Two-wheel vehicles are not listed. They are responsible for 1.4 % of hydrocarbon and benzol emissions and this percentage corresponds to their amount of total distance travelled. Motorcycles are driven mainly in the summer. The high contribution of motorcycle emissions to ozone precursors cannot be derived from their share of total annual motor vehicle emissions.

Figure 1 and Table 1 do not include evaporative emissions produced during refilling at fuel stations. Evaporative emissions amounted to about 3,630 tons in March 1994; about 15 % of hydrocarbon emissions resulting from motor traffic exhaust systems and fuel evaporation.

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