Table 2.

Average (Ave.), Absolute differences (Diff.), and Relative Changes (Change in %) of AQI during three lockdown periods at typical cities over the world from January to June 2020. Summary data are also subdivided into three phases including Pre, during, and Post lockdown regarding each city lockdown dates. n.a.: Data Not Available.

City, Country	Pre lockdown			During lockdown			Post lockdown
	Ave.	Diff.	Change	Ave.	Diff.	Change	Ave.	Diff.	Change
Algiers, Algeria	76.33	1.89	3%	62.36	-4.80	-7%	66.52	-11.21	-14%
Addis Ababa, Ethiopia	72.34	-0.14	0%	70.96	-13.06	-16%	106.49	-4.10	-4%
Kampala, Uganda	142.46	4.88	4%	103.12	-6.47	-6%	139.12	1.59	1%
Abu Dhabi, United Arab Emirates	61.98	-44.29	-42%	66.89	-48.57	-42%	80.61	-46.27	-36%
Kuwait City, Kuwait	114.98	8.06	8%	96.01	-13.90	-13%	106.16	-21.31	-17%
Baghdad, Iraq	117.87	26.25	29%	79.47	-4.03	-5%	78.07	-18.01	-19%
Manama, Bahrain	111.94	-4.49	-4%	111.76	-1.81	-2%	112.92	-15.54	-12%
Dhaka, Bangladesh	213.16	-7.41	-3%	121.32	-6.48	-5%	86.60	-2.03	-2%
Chengdu, China	140.85	-25.13	-15%	122.72	-20.93	-15%	104.95	-11.85	-10%
Beijing, China	116.71	-21.25	-15%	101.40	-18.09	-15%	98.78	-13.38	-12%
New Delhi, India	183.36	-13.25	-7%	114.35	-31.40	-22%	n.a.	n.a.	n.a.
Kolkata, India	187.42	-15.67	-8%	68.84	-35.19	-34%	n.a.	n.a.	n.a.
Jakarta, Indonesia	109.55	32.56	42%	120.86	15.26	14%	98.70	-13.94	-12%
Ulaanbaatar, Mongolia	192.19	-10.12	-5%	64.04	-9.79	-13%	n.a.	n.a.	n.a.
Kathmandu, Nepal	137.45	-22.63	-14%	85.38	-48.06	-36%	33.21	-57.61	-63%
Islamabad, Pakistan	n.a.	n.a.	n.a.	79.46	-48.97	-38%	89.94	0.87	1%
Bogotá, Colombia	52.35	-9.36	-15%	44.17	-3.19	-7%	n.a.	n.a.	n.a.
Lima, Peru	64.21	-10.90	-15%	60.73	-32.18	-35%	n.a.	n.a.	n.a.