The air quality health index (AQHI) remained high to very high across much of Ontario as of Friday, with health officials advising residents to minimize time outdoors.
Wildfire activity in northwestern Ontario has led to evacuation orders and has sent thick smoke sweeping across the region and downwind into parts of the province.
RELATED: Ontario’s AQHI is soaring. Here’s what the numbers mean
Another smoky day on Friday
Although minor improvements were observed over the last 24 hours in southern Ontario, conditions deteriorated again Friday morning.
A wind shift since Thursday has brought some relief to eastern Ontario, where AQHI readings have dropped below warning levels. However, the heaviest smoke is now concentrated over southwestern Ontario.
DON’T MISS: CN workers in viral video of wildfire train cab got out safely, railway says
Looking ahead, winds may push smoke into eastern Ontario and the Ottawa Valley on Saturday, raising AQHI levels to moderate or high. The GTA and southwestern Ontario are likely to see persistent poor air quality into the weekend.
Will the rain actually help?
Rain and thunderstorms over the last 12–18 hours have offered modest relief to areas of northwestern Ontario.
RELATED: From flames to forecasts: How wildfire smoke affects your weather
However, lightning poses the risk of further fire starts, while prevailing poor weather conditions continue to sustain wildfire activity and dense smoke production.
WATCH: Rain relief begins in Thunder Bay
For southern Ontario, a trough moving through into Saturday brings the potential for showers and thunderstorms. However, the persistence of smoke could limit precipitation in some areas.
FORECAST: Severe storm, tornado risk in Ontario Saturday: Will smoke play a role?
Uncertainty remains regarding improvements in southwestern Ontario, as wildfire growth and shifting winds may prolong poor air quality conditions into the weekend. Several days of significant rainfall and higher humidity are needed to make a substantial impact.
Health and visibility impacts:
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Smoke at low atmospheric levels raises health risks
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Increased discomfort for individuals with respiratory conditions
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Hazy skies and the smell of campfire
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Red sunrises and sunsets
DON’T MISS: The Weather Network’s hub for all wildfire information in Canada
Limiting outdoor activity is advised in affected areas.
WATCH: Torontonians shocked by pale, orange sky as smoke invades the city
