Research Article
A Dynamic Analysis of a Motor Vehicle Pollutant Emission Reduction Management Model Based on the SD-GM Approach
Table 11
Description of main variables in stock flow diagram.
| Significant variable | Unit | Variable type | Data source |
| Air pollution charging fee | yuan/day·vehicle | Constant | | Air pollution control | Dmnl | Auxiliary variable | M1+M3 | Amount of GDP | yuan | Level | M1 | Amount of motor vehicles | vehicle | Level | M1 | Amount of motor vehicle trips | vehicle | Auxiliary variable | | Amount of NOx (PMx) generation | ton | Level | M1 | Amount of population | person | Level | M1 | Annual dissipation of NOx (PMx) | ton/year | Flow | | Annual scrapped | vehicle/year | Flow | | Attraction degree of city | % | Constant | M2 | Attraction degree of the growth of vehicles | % | Auxiliary variable | M1+M3 | Attraction degree of vehicle trips | % | Auxiliary variable | M1+M3 | Birth rate | 1/year | Constant | M3 | Contribution rate of NOx (PMx) from vehicle | % | Constant | M2 | Cost of motor vehicle trips | yuan/day·vehicle | Auxiliary variable | M3 | Death rate | 1/year | Constant | M3 | Degree of air pollution | Dmnl | Auxiliary variable | M3 | Dissipation and control rate of NOx (PMx) | 1/year | Constant | M2 | Graphical function of the growth of GDP | Dmnl | Auxiliary variable | M3 | Growth of GDP | yuan/year | Flow | | Growth rate of motor vehicles | 1/year | Auxiliary variable | M1+M3 | Growth of motor vehicles | vehicle/year | Flow | | Growth of population | person/year | Flow | | Growth rate of vehicle ownership | Dmnl | Auxiliary variable | M1+M3 | Impact factor of policy | Dmnl | Constant | M3 | Net migration | person/year | Flow | | Net migration rate | 1/year | Constant | M1+M3 | NOx (PMx) emissions | ton/year | Flow | | Per capita annual income | yuan/person | Auxiliary variable | | Per vehicle annual of NOx (PMx) emissions | ton/year·vehicle | Constant | M2 | Pollution degree of NOx (PMx) | Dmnl | Auxiliary variable | M1+M3 | Population reduction | person/year | Flow | | Ratio of motor vehicle trips | % | Constant | M2 | Scrap rate | 1/year | Constant | M2 | The average of net migration rate | 1/year | Constant | M1 | Weight ratio of PMx (NOx) | % | Auxiliary variable | M3 |
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