Environment Canada issued an air quality statement for the entire province, and Albertans were advised to stay indoors.
Here are some photos from around the city captured by those people who dared to go outside.
Image | Dark sky in Calgary
Caption: The sky was obscured by smoke Thursday. Air quality is considered to be a very high risk to health, according to Environment Canada. (Justin Pennell/CBC)
Image | Smokey Calgary skyline
Caption: Calgary woke up to a smoky skyline on Thursday. (Justin Pennell/CBC)
Image | Smoke
Caption: Calgary stayed smoky Wednesday evening, when Ray Spiteri took this photo. (Ray Spiteri)
Image | Photo
Caption: Andrew Lowe took this picture in Springbank Hill in southwest Calgary on Wednesday evening. (Andrew Lowe)
Image | Downtown smoke 15/8/18
Caption: At 7 a.m. Wednesday, the sun should have been shining in Calgary, but the smoke from the B.C. wildfires produced a dark haze over the city. (Leslie Kramer/CBC)
Image | Calgary smoke before and after
Caption: Ali Beal shared this photo of sunny skies from 6th Avenue and 11th Street S.W. on May 6, left, and with smoky skies on Wednesday. (Ali Beal)
Image | Smoky sun 15/8/2018
Caption: Can you spot the sun in this photo? (Hint: That orange dot in the trees isn't a smudge on your screen) (Tracy Fuller/CBC)
Image | Calgary skyline 15/8/18
Caption: This view of downtown Calgary was breathtaking on Wednesday, but not because of its beauty. (Justin Pennell/CBC)
Image | smoky downtown 15/8/18
Caption: Beth Keeler sent us this photo Wednesday morning of the murky view of downtown from her living room. (Beth Keeler)
Image | peace bridge smoky calgary 15/8/18
Caption: Can you spot the Peace Bridge through that yellow haze? (Justin Pennell/CBC)
Image | Smoky winsport 15/8/18
Caption: Air quality issues at Calgary's WinSport forced outdoor summer camps to move their activities inside for the day on Wednesday. (Dave Will/CBC)
Image | Selena Gignac
Caption: A Calgarian shared these photos of two very different walks on her way to her work in August 2015 and 2018. (Selena Gignac)
Image | Smoky sky Calgary Macleod Trail
Caption: The view into downtown from Macleod Trail, near Erlton Station, was reminiscent of something from a zombie apocalypse film. (Mykin Calalang)
Image | Smoky bridgeland 15/8/2018
Caption: On a normal day, you have a clear view of downtown from this Bridgeland intersection. Today is not normal. (Dave White/CBC)