12/16/2014 05:49 EST | Updated 02/15/2015 05:59 EST

Toronto Fog Creating 'Near Zero' Visibility Driving Conditions

Roberto Machado Noa via Getty Images
TORONTO, ONTARIO, CANADA - 2014/08/23: The CN Tower is a 553.33 m-high concrete communications and observation tower.It was the tallest free standing structure till the construction of Burj Khalifa, 2010. (Photo by Roberto Machado Noa/LightRocket via Getty Images)

Environment Canada has issued a fog advisory for much of the GTA and southern Ontario, warning residents of "near zero visibility" on the roads.

A stagnant mass or air is slowly moving across the region, and many locations are reporting visibility less than 500 metres, the federal weather agency said. 

The fog is expected to last late into the morning, and OPP is asking drivers to allow more time for the morning commute. 

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