Quality level

regarding the SL_2_WST/SLSTR products visualised in SNAP, the very close to the coast pixels have always
quality level one (1), whether the img is cloud free or not. Any suggestions?

Following this page 1 means excellent quallity.

And here it is described what SNAP displays.
So it seems this is inherent to the products. Maybe it is better you ask directly ESA/Eumetsat about it.
You can mail to EOSupport@copernicus.esa.int for example.

Thx for replying marpet, quality level 1 is not acceptable but always appears to pixels close to coastlines.
I’ll email EOSupport, many thanks about the link

Best regards