Before and after photographs from around the world have shown the effect the almost-global lockdown is having on pollution levels.
With far fewer planes in the air and cars on the road during strict measures to stop the spread of coronavirus, cities which were once filled with smog now look like they have much cleaner air.
Use the slider on the images below to see the before and after pictures.
The skyline in Venice, Italy, has become more visible, in a country which has some of the most severe lockdown restrictions.
One of the most dramatic changes can be seen in the city of Milan in the region of Lombardy which has been very badly hit by COVID-19.
Where pollution once hindered the view of the Italian Alps – the mountain range is now clear to see, thanks to the restrictions.
In India, one of the most polluted countries in the world, the lockdown has almost completely revealed the blue skies above Delhi – where the smog normally meant you could not see very far at all.
Indonesia is another one of the world’s most polluted countries which has seen its skylines dramatically change thanks to the lockdown restrictions.
Pakistan, the second most polluted country in the world, according to IQ Air, has also seen a transformative effect on its pollution levels.
In the capital Islamabad, despite the low light levels, you can see far further than before the coronavirus pandemic.