It's a small thing actually. Despite the theory, here in Belgium we have had only one real lock down, and that was two weeks in April 2020. The relentless car

It's a small thing actually. Despite the theory, here in Belgium we have had only one real lock down, and that was two weeks in April 2020. The relentless car traffic was gone and there were no planes. As a consequence, the sky turned a shade of blue I (and others) only remembered from my childhood. Sadly this was short lived as the many further lock downs were mostly just paper pretends, with so many "exceptions" that it was near impossible to distinguish road traffic volume and structural traffic jams from their pre-covid times.