Time division and geographical description
| Periods | Exact date | Implement regions |
|---|---|---|
| Period 1 | 01.01.2000–07.18.2010 | None |
| Period 2 | 07.19.2010–11.25.2012 | GD、LN、HB、SN、YN、TJ、CQ |
| Period 3 | 11.26.2012–01.06.2017 | BJ、SH、HI |
| Period 4 | 01.07.2017–12.31.2021 | None |
| Periods | Exact date | Implement regions |
|---|---|---|
| Period 1 | 01.01.2000–07.18.2010 | None |
| Period 2 | 07.19.2010–11.25.2012 | GD、LN、HB、SN、YN、TJ、CQ |
| Period 3 | 11.26.2012–01.06.2017 | BJ、SH、HI |
| Period 4 | 01.07.2017–12.31.2021 | None |
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