The city is hidden in the fog. a city in the mountainsThe city is hidden in the fog. A city in the mountains
Thick fog in the golden gate strait in san franciscoThick fog in the Golden Gate Strait in San Francisco
Fog over the reservoir near the mountains in blue shadesFog over the reservoir near the mountains in blue shades
Непрозрачный воздух, насыщенный водяными парами, а также загрязнённый пылью, дымом, копотью и т. п..