Here's what the photographer (Anthony Maw) says about that 7 year old pic of Vancouver in the fog.
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Hollyburn Mountain View of Vancouver on a Foggy Day
Vancouver in the fog with Hurricane Hill, in Olympic National Park in Washington State, and 14,400 feet high Mount Rainier stratovolcano almost 300km (200 miles) in the distance, There was a temperature inversion over the entire region of the Earth for approximately one week when the air temperature was warmer at higher altitude and trapping cold damp air near the Earth's surface causing the dense blanket of fog that stretched from Vancouver to Seattle around the entire Georgia Strait and Puget Sound."