Research Article
Multiple‐Factor Influence on Air Quality of Road Motor Vehicles Tail Number Limit in Administrative Area of Beijing, China
Table 1
Impact factors of air quality.
| Number | Impact factor | Effect |
| 1 | Time-year | Periodic change, overall decline | 2 | Time-month | Cyclic change | 3 | Time-day | Cyclic change | 4 | Time | Fluctuations | 5 | Weather | Classification change | 6 | Industrial emissions | Linear relationship | 7 | Opportunity cars | Linear | 8 | Oil and gas quality | Inverse function | 9 | PM2.5 | Partially positive | 10 | PM10 | Partially positive | 11 | SO2 | Partially positive | 12 | CO | Partially positive | 13 | NO2 | Partially positive | 14 | O3_8 h | Partially positive |
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