1. For the calculation of air pollution emissions, read the emission factors for a different reference year.
- Reference year 1990: EMI1990.DAT
- Reference year 1992: EMI1992.DAT
- Reference year 2000: EMI2000.DAT
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Note: During the installation, the files are generated in the directory ...Program files\PTV Vision\PTV Visum 2025\exe\.... |
2. Rename the read emiss.dat file, or enter a name and directory for the desired file in the standard configuration file VISUM.cfg, under option -E, instead of in the emiss.dat standard emission file (Changes to settings in the configuration file).
3. On the Calculate menu, click Environmental impact parameters.
The Environmental parameters window opens.
4. Select the Basis tab.
5. Make the desired changes.
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Element |
Description |
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Calculation base |
The calculation of all environmental calculation procedures is based on transport volumes. Volume PrT [Veh] The volumes are adopted from the assignment results. That means vCur per link and TSys is calculated based on tCur, via link type specific VD functions (Definition and application of volume-delay functions). AddValue1 - AddValue3 The volumes are adopted from the AddValues (count data), i.e. vCur is calculated via link type specific VD functions (Definition and application of volume-delay functions). |
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Valid speed ranges |
The procedure requires the following value ranges for speeds in order to carry out a correct calculation of the air pollution emissions: Pollution-Emis: 10-130 km/h (car); 10-100 km/h (HGV). In this case applies: vMin is considered if vCur < vMin. vMax is considered if vCur > vMax. |
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Noise |
In the list, you can select the parameters for noise volume calculation (Calculating noise volumes). |
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mADT |
For factor = 1.00 per GlobLinkType the pollutants for the time interval for which the traffic volumes are available are calculated. |
6. Select the Pollutants tab.
7. Make the desired changes.
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Element |
Description |
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v0 free speed |
Free flow speed v0 is used for calculation. |
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vCur current speed |
Free flow speed v0 is used for calculation. |
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vCur with time series |
The calculation is based on vCur and is carried out in several steps. Hereby, the total pollution volume is determined by adding the three calculated partial pollution volumes. The first partial pollution calculation is carried out for 50% traffic volume with resulting vCur. The second partial pollution calculation is carried out for further 30% of vehicles with vCur at 80% of traffic volume. The third partial pollution calculation is carried out for the remaining 20% of vehicles with vCur at 100 % traffic volume. |
8. Confirm with OK.
The changes are applied.
9. On the Calculate menu, click Calculate environmental impact > Pollution-Emis.
The air pollution emissions are calculated.
