Wildfire smoke blanketing Ottawa could linger into Tuesday

CTV News

21 hours ago

Clouds and haze over the ByWard Market in Ottawa. Aug. 4, 2025. (Ted Raymond/CTV News Ottawa)
Environment Canada says a cloud of wildfire smoke that is covering the nation's capital could hang overhead into Tuesday.
A special air quality statement is in effect for much of the region as smoke continues to affect most of southern and eastern Ontario.
'The wildfire smoke may persist into tonight and possibly Tuesday before finally easing,' Environment Canada says. 'Air quality and visibility due to wildfire smoke can fluctuate over short distances and can vary considerably from hour to hour.'
The air quality health index (AQHI) for Ottawa was 5, or moderate, at 10 a.m. It is expected to remain around a 5 for most of the day before dropping to a 4, still in the moderate risk category, overnight.
The forecast for Monday calls for widespread smoke with a high of 27 C and a humidex of 32. The UV index is 7, or high.
Expect a few clouds overnight and low of 15 C.
Tuesday's forecast is cloudy in the morning, clearing in the afternoon, with a high of 27 C and a humidex of 32. The AQHI is forecast to drop to 3, or low risk, on Tuesday.
Wednesday's outlook is partly cloudy with a 30 per cent chance of showers and a high of 29 C.
Ways to deal with smoke
Environment Canada says there are ways to deal with wildfire smoke, both inside and outside your home.
'Actions can include using a clean, good quality air filter in your ventilation system and/or a certified portable air cleaner that can filter fine particles,' the weather agency says.
'If you must spend time outdoors, a well-constructed, well-fitting and properly worn respirator type mask (such as a NIOSH-certified N95 or equivalent respirator) can reduce your exposure to the fine particles in the smoke. Even though exposure may be reduced, there can still be risks to health.'