During the first year of the COVID-19 pandemic, global road travel and commercial flight activity decreased by 50% and 60%, respectively, compared to pre-pandemic levels. During the lockdowns that cities imposed in the initial months of COVID, flight activity in particular was reduced to a near standstill, decreasing by 96%—nearly triple the percentage of flight reductions that followed the 9/11 attacks.
Click here for original story, When air and road travel dropped during COVID, so did air pollution levels
Source: Phys.org