This is the 12521st most frequent Polish word.
nakłada
"Applies" or "puts on."
In this sentence, 'nakłada' is used to mean 'apply' or 'put on' something, exemplified by the act of applying paint by an artist.
Artysta nakłada farbę na płótno.
The artist applies paint onto the canvas.
Here, 'nakładają' conveys 'impose' or 'institute' a rule or requirement, as shown by the requirement of wearing masks.
Nakładają obowiązek noszenia maseczek w miejscach publicznych.
They impose the requirement to wear masks in public places.
'Nakłada' in this context refers to the act of placing or positioning material, illustrated by arranging fabric.