Table 2 Monthly values of the regional OPE (in TgO3/TgN).

The OPE was estimated for the global TOB, using the regional COVID-19 NOx emission anomalies. The 1-sigma uncertainties, estimated from the SD (i.e., temporal changes) of the estimated TOB during the analysis period, are also shown.

RegionFebruaryMarchAprilMayJune
Africa2.15 ± 0.082.61 ± 0.231.51 ± 0.171.56 ± 0.081.53 ± 0.12
Europe0.09 ± 0.010.13 ± 0.010.20 ± 0.060.23 ± 0.030.23 ± 0.03
Australia2.68 ± 0.104.01 ± 0.103.16 ± 0.042.54 ± 0.052.40 ± 0.08
Middle East + W Asia0.25 ± 0.010.40 ± 0.050.45 ± 0.050.47 ± 0.050.57 ± 0.05
Rest of Asia1.11 ± 0.041.35 ± 0.031.54 ± 0.151.65 ± 0.071.44 ± 0.04
S America3.65 ± 0.113.55 ± 0.092.75 ± 0.042.47 ± 0.042.21 ± 0.04
N America0.23 ± 0.010.33 ± 0.040.45 ± 0.080.50 ± 0.060.45 ± 0.06
China0.08 ± 0.000.17 ± 0.010.37 ± 0.050.44 ± 0.040.25 ± 0.02