Electronic Supplementary Material (ESI) for New Journal of Chemistry. This journal is © The Royal Society of Chemistry and the Centre National de la Recherche Scientifique 2021

Supporting Information

Time-dependent air quality and pollutants concentration in Jingjinji

region: the future gas capture by green solvents

Yu Chen*,a, Fucai Dai a, Yaoting Duan a, Guipeng Ji *,b, Zhengyang Li c, Cong Liu a, Jixiang Zhang a, Yue Bai a, Xin Wang a

a Department of Chemistry and Material Science, Langfang Normal University, NO. 100 Aimin West Road, Anci District, Langfang

065000, Hebei, P.R. China. E-mail: [email protected]; Phone: +86-0316-2188211.

b College of Aerospace Engineering, University of Chongqing, NO. 174 Shazheng Street, Shapingba District, Chongqing 400044,

China. E-mail: [email protected]; Phone: +86-023-65102521.

c Langfang Qingyue Environmental Technology Co., LTD, NO. 3 Huayuan Road, Economic and Technological Development Zone,

Langfang 065000, Hebei, P.R. China. E-mail: [email protected]; Phone: +86-0316-2682000.

S1 Contents Figure S1. Effect of time on the air pollutants and AQI in Tianjin...... 3 Figure S2. Effect of time on the pollution level and major air pollutants in Tianjin...... 3 Figure S3. Effect of time on the air pollutants and AQI in Shijiazhuang...... 4 Figure S4. Effect of time on the pollution level and major air pollutants in Shijiazhuang...... 4 Figure S5. Comparison of the six air pollutants in in Tianjin...... 5 Figure S6. Comparison of six air pollutants in Shijiazhuang...... 5 Figure S7. Percentage of pollutant level in Tianjin...... 6 Figure S8. Percentage of pollutant level in Shijiazhuang...... 7

S2 2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01 Tianjin 870 AQI 580 290 0 7800 CO 5200

I 2600

Q 0 A

300 O3 r 200 o

3 100 - 0 m 150 NO2 c 100 g

 50

/ 0

81 SO2 s t 54

n 27 a t 0 u l

l 870 PM10

o 580

P 290 0 450 PM2.5 300

150 0 2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01 Date

Figure S1. Effect of time on the air pollutants and AQI in Tianjin.

Pollution Level Tianjin

Excellent l

e Moderate v

e Good L

n Light o i t

u Serious l l

o Severe P

2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01

Major Pollutant PM2.5;PM10 CO t

n PM2.5;O3

a PM10;NO t 2

u PM2.5;NO2 l l NO2;O3 o O3 P PM10;O

r 3 — o j NO2 a PM10 M PM2.5 2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01 Date

Figure S2. Effect of time on the pollution level and major air pollutants in Tianjin.

S3 2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01 Shijiazhuang 870 AQI 580 290 0 7800 CO 5200

I 2600

Q 0 A

300 O3 r 200 o

3 100 - 0 m 150 NO2 c 100 g

 50

/ 0

81 SO2 s t 54

n 27 a t 0 u l

l 870 PM10

o 580

P 290 0 450 PM2.5 300

150 0 2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01 Date

Figure S3. Effect of time on the air pollutants and AQI in Shijiazhuang.

Pollution Level Shijiazhuang

Excellent l

e Severe v

e Light L

n Good o i t

u Moderate l l

o Serious P

2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01

Major Pollutant

PM2.5;NO2 PM2.5;PM10;O3 t

n PM10;NO2

a PM10;O3 t PM2.5;O

u 3 l l O3 o PM2.5;PM10 P

— r SO2 o j NO2 a PM10 M PM2.5 2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01 Date

Figure S4. Effect of time on the pollution level and major air pollutants in Shijiazhuang.

S4 Tianjin PM2.5 250 PM10

8000 SO2 200

NO2 7000 150 O3 3 - 6000 CO m 100 c

g 5000

 50

/

4000 t 0 n

a 3000 2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01 t u l l 2000 o P 1000

0 2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01 Date

Figure S5. Comparison of the six air pollutants in in Tianjin.

Shijiazhuang PM2.5 250 PM10

8000 SO2 200

NO2 7000 150 O3 3 - 6000 CO m 100 c

g 5000

 50

/

4000 t 0 n

a 3000 2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01 t u l l 2000 o P 1000

0 2016-01-01 2017-01-01 2018-01-01 2019-01-01 2020-01-01 Date

Figure S6. Comparison of six air pollutants in Shijiazhuang.

S5 Excellent Good Light Moderate Severe 26.7% Serious 10.1%

8.9%

4.6%

0.8% 49.0%

Figure S7. Percentage of pollutant level in Tianjin.

S6

Excellent Good Light Moderate Severe 29.2% 4.3% Serious 11.9%

9.3%

3.3% 42.1%

Figure S8. Percentage of pollutant level in Shijiazhuang.

S7