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1.Climate as a Public Interest in Planning and Zoning
2.Characteristics and Forms of the Urban Climate
2.1Overview
2.2Urban Heat Budget
2.3Urban Heat Islands
2.4Humidity / Precipitation / Vegetation
2.5Wind
2.6Bioclimate
2.7Air Exchange
2.8Pollutant Emissions
2.8.1The Traffic as Pollutant Source
2.8.2Computational Estimation of Traffic Immissions
2.9Pollutant Levels and Threshold Values
2.9.1Limits and Assessment values
2.10Effect of Pollutant
2.11Climate Change
2.11.1Climate Change in Germany
2.11.2Prevention of Climate Change
2.11.3Adaption to Climate Change
3.Energy-Conscious Planning and Zoning
4.Methods of Information Acquisition for Planning (Measurements, Wind Tunnels, Numerical Modelling)
5.Climatic and Air Hygiene Maps as Aids for Planning and Zoning (Example: Climate Atlas Federation Region Stuttgart)
6.Recommendations for Planning
7.Bibliography
8.Thematic Websites
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CHARACTERISTICS AND FORMS OF THE URBAN CLIMATE
   
 2.8.1 The Traffic as Pollutant Source

The growth in individual motorized traffic (IMT) – which can be expected to continue increasing in the future with the common market of the European Community and the opening of the borders to the East – places new demands on transportation policy. In many places, people today already speak of a collapse in traffic conditions on the roads, particularly in built-up areas. This increase in traffic is connected with a substantial burden on the environment, especially through noise and air pollution.

The emissions have not only local and regional significance. With CO2 emissions from transport, this aspect will receive a completely new global dimension (see also Chapter 2.11).

The automobile dominates person and cargo traffic in the Federal Republic of Germany. As such, in 2009 about 80% of the 1123 billion total person-kilometers were driven with passenger cars, and nearly 71% of the 583 billion total ton-kilometers were driven with trucks.

Figure 2/19 shows the proportion of pollutant emissions attributed to road traffic in the Federal Republic of Germany in reference to the year 2009. The amount of pollutants produced by traffic was 19% of particulate matter PM10, 45% of nitrogen oxide (as NO2), 10% of NMVOC, and 19,5% of the greenhouse gas carbon dioxide (CO2).

The European Commission adopted a white paper entitled "Roadmap to a Single European Transport Area – Towards a competitive and resource efficient transport system" (KOM(2011) 144 final). The white paper studies our future transport challenges (dependence of transport on oil as energy source, CO2 emissions, increasing traffic volume, increasing costs through congestion, road safety). Ten goals for a competitive and resource efficient transport system are defined on that basis (DStGB, Deutscher Städte- und Gemeindebund (German Association of Towns and Municipalities), 2011).

These goals are very ambitious. They include:


  1. Halve the use of conventionally-fuelled cars in urban transport by 2030; phase them out in cities by 2050. Achieve CO2-free city logistics in major urban centres by 2030.

  2. Reduce CO2 emissions from maritime traffic by 40 % by 2050. Increase the use of low-carbon sustainable fuels in aviation to reach 40 % by 2050.

  3. Shift 30 % of road freight over 300 km to other modes such as rail or waterborne transport by 2030. More than 50 % even should be shifted by 2050.

  4. Complete a European high-speed rail network by 2050. Triple the length of the existing high-speed rail network by 2030.

  5. Develop an EU-wide multimodal core network (TEN) by 2030 including a corresponding set of information services.

  6. Connect all core network airports to the rail network by 2050. Furthermore, connect all core seaports to the rail freight system.

  7. Deploy the modernised air traffic management infrastructure in Europe by 2020 and complete the European Common Aviation Area. Furthermore, deploy the European Global Navigation Satellite System (Galileo) by 2020.

  8. Establish the framework for a European multimodal transport information, management and payment system by 2020.

  9. Move close to zero fatalities in road transport by 2050. Halve road casualties by 2020.

  10. Move towards full application of “user pays” and “polluter pays” principles and private sector engagement to eliminate distortions. Convert the transport system to generate revenues and thus ensure financing for future transport investments.
The combustion of petrol or diesel in an automobile motor produces an array of pollutants, of which the following pollutant components stand out in particular measure:

  • Nitrogen Oxides (NOx) = Nitrogen Monoxide and Dioxide (NO, NO2)
  • Particulate Matter, for example (PM10)

    The starting point for the consideration of both emission-side and immission-side exhaust gas levels on roads is the specific pollutant output of motor vehicles, which varies strongly with the respective operating condition. Petrol and diesel motors also exhibit large differences in emissions behavior.

    The emission rates of pollutant components in automobile exhaust can be calculated by the multiplication of the temporal traffic volume by the so-called "exhaust emissions factors," which are based in turn on the emissions of an individual car or truck in average condition.

    Motor vehicle emissions depend on the speed and manner of driving, i.e. the so-called "driving models" on the roads. A specific driving model can be assigned to every traffic situation. Table 2/3 gives an overview of various driving models with the indication of the average driving speed.

    Basis for determining the exhaust emission factors is the Handbook Emission Factors for Road Transport (Infras, 2010) . For this preparation following traffic situations can be used:

    AB120:

    Motorway, speed limit 120 km/h

    AB100d:

    Motorway, speed limit 100 km/h, heavy traffic

    AB80d:

    Motorway, speed limit 80 km/h, heavy traffic

    ABS80d:

    Urban motorway, speed limit 80 km/h, heavy traffic

    AOS-HVS80:

    Urban motorway, speed limit 80 km/h

    AOS-HVS80d

    Urban motorway, speed limit 80 km/h, heavy traffic

    AOS-HVS70

    Urban motorway, speed limit 70 km/h

    AOS-HVS60:

    Urban motorway, speed limit 60 km/h

    AOS-HVS60d:

    Urban motorway, speed limit 60 km/h, heavy traffic

    AOS-HVS50:

    Urban motorway, speed limit 50 km/h

    AOS-HVS50d:

    Urban main road, speed limit 50 km/h, heavy traffic

    AOS-HVS50g: Urban main road, speed limit 50 km/h, saturated traffic
    IOS-NS40: Urban side street or development road, speed limit 40 km/h

    IOS-NS40g:

    Urban side street or development road, speed limit 40 km/h, saturated traffic

    Table 2/3: Examples of various styles of driving for different types of roads; Source: Lohmeyer by INFRAS 2010.

    In these factors, road gradients and cold engine starts can also be taken into consideration. A cold engine increases exhaust emissions, as the catalytic converter is not yet fully functioning. One can choose in the database from emissions factors for various vehicle categories (e.g. car, truck, bus, motorcycle) as well as years of reference.

    Table 2/4 lists examples of emissions factors. Benzene emissions tend to decrease with rising vehicle cruising speeds. Remarkably, in the cases of NOx and particulates the emissions factor is roughly 10 times that for trucks as for cars.

    Various calculation models are used for the evaluation of pollutant levels on roads (see Chapter 4.3). Usually these are the Gauss model, the Lagrange model, and the Box model, the last being used especially for street canyons.

    Wind tunnel analyses also come into play for the simulation of the exhaust gas propagation on streets and for the quantification of the resulting immission levels (see Chapter 4.2).

    road parameters

    specific emission factors for each vehicle (g/km) 2010


    traffic

    conditions



    speed

    (cars) 


    NOx
    PM10/ PM2,5
    (only exhaust gases)

    PM10
    (only wear and resuspension)


    PM2,5
    (only wear)
    LV
    SV
    LV
    SV
    LV
    SV
    LV
    SV
    AB120
    92,8
    0,317
    3,306
    0,0133
    0,0604
    0,022
    0,2
    0,012
    0,053
    AB100d
    122,0
    0,481
    3,004
    0,0186
    0,0517
    0,022
    0,2
    0,011
    0,048
    AB80d
    75,5
    0,257
    3,531
    0,0118
    0,0606
    0,022
    0,2
    0,015
    0,056
    ABS80d
    71,0
    0,229
    4,089
    0,0103
    0,0821
    0,022
    0,2
    0,016
    0,059
    AOS-HVS80
    70,0
    0,229
    3,717
    0,0083
    0,0671
    0,022
    0,2
    0,016
    0,060
    AOS-HVS80d
    56,4
    0,279
    4,455
    0,0099
    0,0685
    0,022
    0,2
    0,018
    0,066
    IOS-HVS70
    45,0
    0,322
    5,017
    0,0145
    0,0699
    0,04
    0,38
    0,021
    0,062
    IOS-HVS60
    37,0
    0,411
    6,081
    0,0167
    0,0985
    0,05
    0,45
    0,022
    0,062
    IOS-HVS60d
    30,8
    0,390
    6,341
    0,0158
    0,0922
    0,06
    0,6
    0,022
    0,062
    IOS-HVS50
    52,0
    0,312
    4,149
    0,0137
    0,0595
    0,022
    0,2
    0,019
    0,057
    IOS-HVS50d
    43,0
    0,336
    4,860
    0,0148
    0,0652
    0,022
    0,2
    0,021
    0,062
    IOS-HVS50g
    66,2
    0,308
    3,759
    0,0138
    0,0549
    0,022
    0,2
    0,016
    0,053
    IOS-NS40
    36,8
    0,396
    6,423
    0,0166
    0,0993
    0,04
    0,38
    0,022
    0,062
    IOS-NS40g
    23,1
    0,512
    8,312
    0,0200
    0,1255
    0,06
    0,6
    0,022
    0,062

    Table 2/4:Emission factors in g / km per vehicle for the forecast year 2015, Source: Lohmeyer by INFRAS (2010)

  •  
     
     
    Fig. 2/19: Proportion of pollutant emissions attributable to traffic in Germany (2009); Source: UBA