Table 2.

Trace gas densities in provinces of Ecuador during the periods.

Province	Before Lockdown	Lockdown	After Lockdown	% change post to pre lockdown
Nitrogen dioxide (μmol/m2)
Santo Domingo de los Tsáchilas Province n = 1369	48 ± 49	48 ± 49	55 ± 78	+14%*
Guayas Province n = 2516	54 ± 12	50 ± 80	62 ± 13	+15%*
DMQ n = 5254	42 ± 57	40 ± 52	48 ± 78	+19%*
Sulfur dioxide (μmol/m2)
DMQ n = 5254	31 ± 53	34 ± 60	34 ± 84	+9.7*
Guayas Province n = 6919	11 ± 18	21 ± 20	48 ± 40	+380%*
Santa Elena Province n = 2701	12 ± 14	19 ± 45	42 ± 45	+250%*
Morona Santiago Province n = 2627	11 ± 23	12 ± 20	29 ± 130	+164%*
Chimborazo Province n = 1480	13 ± 19	31 ± 33	40 ± 84	+208%*
Ozone (mmol/m2)
DMQ n = 5254	113 ± 0.3	110 ± 0.1	112 ± 0.4	−01%**
Guayas Province n = 1665	115 ± 0.3	112 ± 0.1	114 ± 0.4	−08%**
Pastaza Province n = 14393	115 ± 0.3	111 ± 0.1	114 ± 0.4	−08%**
Sucumbios Province n = 7178	115 ± 0.3	112 ± 0.1	114 ± 0.4	−08%**

*: Significant difference; **: non-significant difference See text for details.