Blue sky again. White clouds. Why a change back to normal?
Because the pollution has stopped, simple.
Hardly any airoplanes. No wagons. fewer cars.
Contrails were blocking out the sun every day before the current shut down. It was so bad that it was difficult to see the planes crossing the sky it was so murky up there.
This pollution could be responsible for the death of insects and the consequential lack of plant pollination.