@mbm12 Yes, there is usually delay around 5 min, but in general it is real-time.

Only automatic weather stations refresh at such a frequency.
You can also use observations for closest METAR weather stations (every 30m).
For clouds you can use images from METEOSAT satellite, refreshed every 15m. Radar data is also available in your area, but it doesn't provide clouds or wind observations.
Forecast models available on Windy only refresh every hour (in best cases).

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All right thank you all for your detailed replies, I was just going to ask further questions about how can we use these measurements to decide, according to local regulations, how is the air quality but it seems that the way the SO2 concentrations are calculated differently.

@golfromio
For me it works with the iOS app. The weather picker shows the % of cloud cover.

@idefix37 Oh, sorry!
I thought that these two links can be useful.

@παναγία-μπητρος
https://community.windy.com/topic/16053/ecmwf?_=1618399342791

@omarina Hello, if you want to deselect it, then click on "Empty map". Screenshot 2021-04-14 at 09.46.32.png

@ydp
Wind direction and all directions in Windy are true of course.
Cloud levels are referring to pressure levels same as other parameters shown at different altitude by the altitude slider.
Pressure is amsl.
More details about each layer by clicking the small i

D74DBED1-736F-4CF8-8230-B8CE520B31E2.jpeg

Additional information
https://community.windy.com/topic/3361/description-of-weather-overlays