Table 1 FI of wintertime PM₁₀ in nine regional core cities in Scenario one.

	SO₂ (%)	NO₂ (%)	O₃ (%)	CO (%)
Beijing, BTH
2014–2015	8.7	6.9	6.3	78.1
2015–2016	13.2	12.8	4.6	69.4
2016–2017	5.2	4.9	4.2	85.8
2017–2018	10.0	9.8	12.6	67.7
2018–2019	6.0	12.7	14.2	67.1
Tianjin, BTH
2014–2015	5.7	13.4	6.3	74.6
2015–2016	9.0	9.8	4.8	76.4
2016–2017	5.8	8.1	5.2	81.0
2017–2018	12.1	11.3	10.3	66.3
2018–2019	7.0	11.4	11.8	69.8
Shanghai, YRD
2014–2015	13.4	5.0	5.8	75.8
2015–2016	50.0	7.6	12.0	30.4
2016–2017	13.4	9.1	11.8	65.7
2017–2018	36.5	5.9	8.1	49.5
2018–2019	25.3	12.3	12.7	49.5
Nanjing, YRD
2014–2015	27.2	6.4	6.6	59.8
2015–2016	18.4	13.7	13.4	54.5
2016–2017	24.1	10.4	9.5	56.0
2017–2018	13.9	8.6	8.8	68.7
2018–2019	18.6	10.8	9.3	61.3
Hangzhou, YRD
2014–2015	44.8	8.4	12.6	34.3
2015–2016	27.3	12.6	9.4	50.7
2016–2017	19.3	32.9	12.3	35.5
2017–2018	20.5	7.7	9.0	62.8
2018–2019	44.5	13.1	15.7	26.7
Guangzhou, PRD
2014–2015	45.6	21.5	7.7	25.2
2015–2016	30.1	45.9	10.3	13.7
2016–2017	51.5	27.2	8.2	13.1
2017–2018	59.3	10.2	8.5	22.0
2018–2019	7.1	64.0	14.6	14.3
Shenzhen, PRD
2014–2015	39.6	28.9	17.3	14.2
2015–2016	35.9	22.5	17.1	24.5
2016–2017	40.9	17.6	12.9	28.6
2017–2018	49.0	18.1	14.2	18.7
2018–2019	37.6	27.8	15.1	19.5
Chengdu, SCB
2014–2015	14.7	50.70	8.1	26.5
2015–2016	49.6	10.6	7.6	32.2
2016–2017	20.3	10.6	10.1	59.0
2017–2018	8.6	26.4	14.0	51.0
2018–2019	28.8	41.4	14.6	15.2
Chongqing, SCB
2014–2015	53.5	18.2	6.5	21.8
2015–2016	20.0	43.5	13.6	22.9
2016–2017	49.3	10.9	7.6	32.2
2017–2018	47.1	24.6	10.5	17.8
2018–2019	20.0	52.3	9.3	18.4

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