Smog appears in Canada ?

Due to my love of photography, I am very sensitive to the weather every day. These days, I suddenly found that Montreal, which has always had blue skies and white clouds, has a weather condition that looks like fog and dust. My intuition told me that this is smog. Later, I saw in the newspaper that due to forest fires and industrial pollution, smog has appeared in Montreal and southern Quebec, with the air quality reaching "severe" levels. The PM2.5 index in Montreal exceeded 115, compared to the normal level of 35. 001. The smog that has persisted for several days has made the usually blue sky and white cloud Montreal look dirty. 002. As expected, I saw a report on "Montreal under smog" in the subway newspaper, showing that PM2.5 is fair, regardless of how clean the sky has been historically - if you mistreat it, it will retaliate. 003. Wildfires spreading in several areas in northern Quebec have caused smog to shroud Montreal and other southern parts of the province. The meteorological department said that the air quality in this area will be between "severe" and "acceptable" in the next few days. The north and northwest winds are blowing smoke and dust from wildfires in northern Quebec and Labrador towards the southern parts of Quebec, along with industrial pollutants from the United States and Ontario. Currently, the PM2.5 index in Montreal exceeds 115, while the normal level is 35. "During the smog period, symptoms such as dizziness, coughing, difficulty breathing, and eye discomfort may occur." Doctors advise patients with chronic respiratory diseases to reduce outdoor activities. 004. The transportation department recommends taking public transportation, and has also introduced discounts: $1 (Canadian dollars) for two consecutive days of bus rides in Laval, a satellite city of Montreal (normally $3 CAD). 005. Montreal, known for its blue skies and white clouds, with the famous Saint Joseph's Oratory.