small particles of carbonaceous material suspended in the air, which restrict visibility
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The extent of obscurity is dependent on the amount of smoke particles and humidity, as the former serve as nuclei for the latter. Smoke is a residue from combustion.
Halva horisontaalse nähtavuse põhjuseks on udu, uduvine, tuisud, vedelad või tahked sademed, aga ka inimtegevusest põhjustatud nähtused nagu suits ja sudu.
Obscurations are any phenomenon in the atmosphere, other than precipitation, that reduces the horizontal visibility in the atmosphere. The obscuration types are: mist (BR), fog (FG), smoke (FU), volcanic ash (VC), widespread dust (DU), sand (SA), haze (HZ), and spray (PY). Spray (PY) is coded only as BLPY.
