Upcoming Wildfire Smoke Poses Serious Air Quality Risks for Southern Ontario

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While we've seen some marginal improvement in air quality this evening as surface-level smoke dissipates, Southern Ontario isn't out of the woods just yet. An extensive plume of smoke is shifting our way and is expected to affect the region overnight and into early Wednesday.

Current data suggest that this incoming wave of smoke could degrade air quality even further than what we witnessed today. Petawawa is already feeling the impact with an Air Quality Index (AQI) of 430, a level significantly above the "very hazardous" category. In fact, Petawawa currently has some of the worst air quality globally, excluding specific regions in South America and India.

This severe air quality is what we anticipate waking up to on Wednesday. Models suggest the heaviest smoke concentration will target Eastern and Central Ontario, although the Greater Toronto Area (GTA) may also face thick smoke. While less smoke is expected in the southwest, air quality remains a concern across the region.

While we predict some respite later on Wednesday, brace for the arrival of an even more intense smoke plume on Thursday, potentially affecting the GTA and Southwestern Ontario. The severity of this situation is unprecedented, making it difficult to predict the exact level of impact.

Many locations across Southern Ontario may report the worst air quality in recorded history, and the pollutants in the air could pose a critical threat to those exposed for extended periods. We recommend staying indoors as much as possible over the next couple of days, especially during the early part of Wednesday and Thursday. This is a serious health concern, regardless of pre-existing conditions.

Looking ahead, a shift in wind direction over the weekend might provide a temporary respite, but the potential for more smoke next week remains, depending on fire activities.

At Instant Weather, we are committed to providing regular updates on active wildfires, smoke, and air quality across Southern Ontario. Please continue checking our updates for crucial information in the coming days.