![]() A dense fog develops if the liquid water droplets or ice crystals formed by condensation are trapped and concentrated in a shallow layer near the ground by a temperature inversion (in which temperature increases with height rather than decreasing with height as is usual). Radiation fog forms most commonly as moist air is cooled below its dew point, ie, the critical temperature at which air can no longer hold all its water vapour. Argentia, Nfld has the most fog of any place in Canada, averaging 206 days per year. Penticton, BC, receives least fog, an average of 4 days per year. John's, Nfld, with fog reported on an average of 126 days per year Halifax, NS, with 74 Vancouver, BC, with 62. ![]() The major centres in Canada that experience most fog are St. Near or downwind from industrial centres, combustion products such as smoke, soot, sulphuric and nitric oxides can combine with and acidify fog ( see ACID RAIN). In contrast, haze is a condition where such dry atmospheric particles as dust, ocean salt, natural oils from forest vegetation or forest-fire smoke are present in sufficient quantity to obscure vision. For practical purposes, in Canada, a reduction of visibility to 1000-9600 m is arbitrarily called mist reduction to under 1000 m is called fog. Fog is a concentration of minute water droplets or ice crystals of sufficient density to reduce visibility (Corel Professional Photos).įog Fog, concentration of atmospheric particles (usually minute water droplets or ICE crystals) of sufficient density to reduce visibility.
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