Table 1.

Pandora sites (including names of local principal investigator (PI)), and mean, standard deviation (SD), and maximum (max) total column NO₂ (TCNO₂) amounts (based on half-hour averages) measured before (pre-) and after (post-) the COVID-19 lockdown in New York.

			TCNO2 (in DU)
			Apr–May		Jun–Aug		Sept–Nov		Dec–Feb
Pandora name, #, location (principal investigator)	Temporal range of data (mm/yyyy)		Pre-	Post-	Pre-	Post-	Pre-	Post-	Pre-	Post-
Manhattan, NY	12/2017–05/2021	mean	0.61	0.39	0.59	0.44	0.59	0.46	0.71	0.48
PSI#135		SD	0.34	0.25	0.35	0.24	0.38	0.27	0.45	0.30
40.8153°, −73.9505°		max	3.11	3.25	3.77	2.09	2.94	1.89	3.13	2.05
(Maria Tzortziou)		change	−36 %		−25 %		−22 %		−32 %
Queens, NY	05/2018–05/2021	mean	0.61	0.48	0.54	0.51	0.57	0.51	0.73	0.70
PSI #140, #55		SD	0.35	0.21	0.28	0.19	0.33	0.22	0.40	0.38
40.7361°, −73.8215°		max	3.42	3.60	2.74	1.54	3.36	2.34	3.04	2.81
(James J. Szykman)		change	−21 %		−6 %		−11 %		−4 %
New Brunswick, NJ*	05/2018–01/2021	mean	0.32	0.26	0.29	0.28	0.34	0.30	0.42	0.26
PSI #56, #69		SD	0.15	0.18	0.15	0.20	0.24	0.21	0.31	0.10
40.4622°, −74.4294°		max	1.46	2.06	1.98	2.42	2.55	4.59	2.72	0.53
(James J. Szykman)		change	−19 %		−3 %		−12 %		−38 %
New Haven, CT	05/2018–05/2021	mean	0.38	0.27	0.34	0.29	0.34	0.29	0.36	0.33
PSI #20, #64		SD	0.11	0.08	0.09	0.08	0.15	0.13	0.17	0.18
41.3014°, −72.9029°		max	0.75	0.78	0.77	0.83	1.71	1.13	1.37	1.83
(James J. Szykman)		change	−29 %		−15 %		−15 %		−8 %

The December–February period for New Brunswick contains 16 d of data in December 2020, 1 d of data in January 2021, and no data in February 2021.