* Covid-19 global lockdown.
Planes grounded for weeks, cars parked, industries/factories shut down around the world.

Air Pollution had dropped globally due to this, like the planet is healing itself.
People living in some parts of India are seeing the Himalaya mountains crystal clear for the first time in decades.

This happened after the coronavirus quarantine reduced the amount of pollution in the country and helped the air clear up a bit.

https://www.boredpanda.com/himalayas-mountains-coronavirus-pollution-levels-drop/?utm_source=google&utm_medium=organic&utm_campaign=