The air is definitely cleaner - here's how I can tell.

Whenever I want to sit out on the balcony, with my feet up on the railing, a cup of coffee in one hand, a book in the other, I have to wipe down the chair and table that are permanently outside.

When I do so, I see black streaks of soot and dirt on the white plastic table top. These days, though, the level of dirt is much reduced. What I wipe off these days is mostly yellow - pollen.

Coronavirus is great for the environment, it seems. But not so great for the economy. You win some, you lose some.