You've probably never been in a city that has bad pollution if you think this way.
Of course, 3 months of lockdown won't eliminate decades of pollution, but clearing the air and letting all the airborn suspended particles fall to the ground and pulling the dust out of the air makes it clear.
The other viewpoint is that you just don't realize how bad modern pollution is. In Toronto, ON, people are reporting being able to see Niagara Falls from a regular vantage point in the city after a few months of shutdown.
Of course, 3 months of lockdown won't eliminate decades of pollution, but clearing the air and letting all the airborn suspended particles fall to the ground and pulling the dust out of the air makes it clear.
The other viewpoint is that you just don't realize how bad modern pollution is. In Toronto, ON, people are reporting being able to see Niagara Falls from a regular vantage point in the city after a few months of shutdown.