Oshawa, ON Live Wildfire Smoke Map
Get Alerts For Wildfires In Your Area
The moment a wildfire starts near you, you'll get an instant alert and simple tips to reduce your smoke exposure.
What's In The Smoke
30xSmaller than a human hair
Fine enough to reach deep into the lungs. A MERV 13 is built to capture it.
How Far It Travels
It Doesn't Stay Local
Smoke rides the wind far downwind — you can get smoky air with no fire nearby.
What To Do During A Smoke Event
Simple steps to reduce indoor exposure.
- Stay In, Close UpShut windows and doors to keep smoke out.
- Set Fan To "On"Keeps air cycling through your filter, not just when heating or cooling.
- Recirculate AirSwitch off fresh-air intake so you're not pulling smoke in.
- Run A MERV 13Built to capture the fine PM2.5 in smoke.
- Add A PurifierExtra filtration for the room you use most.
- Wear an N95 if OutsideFits snug to block fine particles — a cloth mask won't.
The Best Air Filter For Wildfire Smoke
During smoke events, the EPA recommends upgrading to a MERV 13 filter — or the highest-rated filter your system can handle — to help reduce the fine particles smoke brings indoors. MERV 13 is the level most home HVAC systems can run while still capturing PM2.5, the fine particulate that makes up the bulk of wildfire smoke.
- Captures PM2.5 particles
- Blocks ash, soot, and smoke odor
- Keeps your indoor air safe—even when the outdoor air is dangerous
- Meets the EPA's recommended rating for filtering fine wildfire smoke particles.
Wildfire Smoke FAQs
Facts About Wildfires
Over 70,000 wildfires burn in the U.S. every year.
Wildfire smoke can travel 1,000+ miles, affecting states that aren't even near the blaze.
Exposure to wildfire smoke can worsen asthma, trigger heart issues, and lead to ER visits.
Indoor air can hold more fine particles during wildfire events unless it's properly filtered.
The EPA advises using MERV 13 filters or portable HEPA air cleaners during wildfire smoke events.
Don't Wait Until The Smoke's Inside.
Use the live wildfire smoke tracker and upgrade your air filters today to protect your lungs and your home.
Shop Filters For Smoke Protection
Live Oshawa, ON Forest Wildfire & Smoke Map Today: Local Air Quality Tracking & Indoor Protection Solutions
TL;DR
Use the live map at the top of this page to see active fires and smoke plumes around Oshawa, Ontario today. Oshawa sits about 270 km south of Ontario's forest fire region, so the local risk is drifting smoke, not nearby flames. When the map shows a U.S. AQI of 100 or higher, put a MERV 13 filter in the furnace, set the fan to On, run a HEPA air cleaner in each occupied room, and close the house up.
Key Takeaways
Oshawa is outside Ontario's forest fire region; report any grass, brush, or wildland fire in the city by calling 911.
Air Quality Ontario Station 45027, about 7 km north-northwest of downtown, is the only AQHI station Air Quality Ontario lists in Durham Region.
Four recent smoke events reaching Durham Region came from fires about 590 to 2,040 km away, and three sat on almost the same northwest line from Oshawa.
Filterbuy's action line: at AQI 100 or higher on the map, use a MERV 13 furnace filter, set the fan to On, run a portable HEPA air cleaner in each occupied room, and close up the house.
How to Read the Live Oshawa Wildfire and Smoke Map Above
The live Oshawa wildfire and smoke map at the top of this page shows where today's smoke started and whether it's heading toward Durham Region.
The map combines three layers:
Fire locations: U.S. data from WFIGS and the National Interagency Fire Center, plus Natural Resources Canada fire data.
Smoke plumes: satellite-traced by the NOAA/NESDIS Hazard Mapping System (HMS).
Watches and warnings: weather alerts that can shift fire behaviour and smoke.
Start zoomed out, since Oshawa's smoke usually starts hundreds of kilometres away. A plume outline doesn't show how high smoke sits, so confirm ground-level conditions with the Oshawa AQHI. For a ground-level forecast, FireSmoke.ca, run by the University of British Columbia, models hourly PM2.5 (the fine particles in smoke) across Canada.
Is There a Forest Fire in Oshawa Today?
Oshawa is not part of Ontario's forest fire region. Communities south of the French and Mattawa rivers, including Oshawa, report any grass, brush, or forest fire by calling 911, according to Ontario's forest fire reporting guidance.
Filterbuy Canada measured the gap: Mattawa, on the region's southern edge, is about 270 km due north of Oshawa City Hall. Ontario's legislated fire season runs from 1 April to 31 October.
Locally, the City of Oshawa's open air burning rules (By-law 73-2012) ban most outdoor fires, including campfires and chimineas, and Oshawa Fire Services has suspended burn permits during poor air quality.
Where Does Oshawa's Wildfire Smoke Come From?
Filterbuy Canada calculated the straight-line distance from Oshawa City Hall to the sources of four recent smoke events that reached Durham Region and the Greater Toronto Area. They sit about 590 to 2,040 km away, and three fall within five degrees of the same northwest bearing.
Filterbuy Canada haversine calculation from Oshawa City Hall (43.897, -78.866), rounded to 10 km. Fires covered wide areas, so distances are approximate.
When the map shows large fires in northwestern Ontario or the Prairies, watch the Oshawa AQHI forecast over the next few days, even under a clear sky. Quebec smoke comes from the north-northeast instead (Global News, June 2023). In July 2026, Lake Nipigon smoke led Whitby and Ajax to move outdoor programs indoors (Frequency News).
Oshawa's Air Quality Monitoring Station
Air Quality Ontario Station 45027, at the EP Taylor Stables site on Britannia Avenue West, measures ozone, PM2.5, and nitrogen dioxide, the three pollutants behind the Air Quality Health Index (AQHI).
By our calculation from its published coordinates, it sits about 7 km north-northwest of City Hall. It's the only AQHI station Air Quality Ontario lists for Durham Region, so our Whitby wildfire and smoke map and Ajax wildfire and smoke map pages use the same readings.
Check the Oshawa AQHI forecast from Environment and Climate Change Canada for the next few days, and pair it with the map's smoke layer, since lakeshore neighbourhoods can differ from north Oshawa.
What Do Oshawa AQHI Readings Mean During Wildfire Smoke?
The AQHI is Canada's 1 to 10+ scale for the health risk of air pollution. During wildfire smoke events, Environment and Climate Change Canada adjusts the AQHI formula to use PM2.5 alone, hour by hour, so the index tracks fast-changing smoke more closely.
Source: Environment and Climate Change Canada (messages condensed).
The live map reports the U.S. Air Quality Index (AQI), a separate 0 to 500 scale. Use the map to see where smoke is, and the AQHI for official health messaging.
The Region of Durham Health Department's wildfire smoke guidance for schools and child care centres moves activities indoors whenever possible at AQHI 7 to 10, and moves all outdoor activities indoors at 10+.
Supporting Statistics
1. Wildfire smoke carries a measurable health burden in Canada.
Up to 240 deaths a year are linked to short-term exposure (2013 to 2018).
Up to 2,500 deaths a year are linked to long-term exposure.
Source: Health Canada, human health effects of wildfire smoke report summary
2. Ontario's 2025 fire season burned far more land than usual.
643 wildfires burned 597,654 hectares (about 5,976 square kilometres).
The 10-year average is 712 fires and about 2,100 square kilometres.
That's roughly 2.8 times the average area.
Source: Ontario Association of Fire Chiefs, reporting provincial ministry figures
3. Canada's 2025 season started fast.
By 12 June 2025, more than 3.7 million hectares had burned nationally.
225 wildfires were active, and 121 were out of control.
What to Do When the Oshawa Smoke Map Shows AQI 100 or Higher
Start with official guidance. If Environment and Climate Change Canada issues an air quality statement for Oshawa, or Durham Region Health advises staying indoors, follow that first; filtration is one layer of a smoke plan. Filterbuy's action line: when the live map shows a U.S. AQI of 100 or higher, put a MERV 13 filter in your furnace, set the thermostat fan to On, run a portable HEPA air cleaner in each occupied room (bedrooms first), and close the house up.
The U.S. Environmental Protection Agency recommends a MERV 13 or higher filter in a central HVAC system during smoke events.
1. Put a MERV 13 filter in the furnace. This is the whole-home layer, because your central system moves far more air than any portable unit. Filterbuy Canada carries MERV 13 (Optimal) air filters, the tier we recommend for smoke. Match the size printed on your current filter, as with any replacement. The University of Waterloo's Intact Centre on Climate Adaptation gives the same MERV 13 advice in its wildfire smoke home protection guide.
2. Set the thermostat fan to On. On "Auto," the system only filters while it's heating or cooling. "On" keeps air moving through the filter all day.
3. Run a portable HEPA air cleaner in each occupied room, bedrooms first. The furnace filter treats the whole house, and a portable unit treats one room harder, so use both. Health Canada's portable air cleaner guidance says the smoke CADR should be at least two-thirds of the room's area, so a 300 sq ft bedroom needs a smoke CADR of about 200. Skip any air cleaner that produces ozone, as Health Canada advises.
4. Close the house up. Shut windows and doors, and set any heat recovery ventilator to recirculate if it allows. While smoke is in, skip candles, incense, frying, smoking, and vacuuming without a HEPA vacuum.
No ducted furnace? In apartments and homes with baseboard or boiler heat, portable HEPA air cleaners are your primary defence, not a supplement. Start with the bedroom.
DIY box-fan cleaners are a stopgap. EPA research on DIY air cleaners found box fans fitted with MERV 13 filters reduced smoke in lab tests. Use a UL- or ETL-certified fan from 2012 or newer, never leave it running unattended, and treat it as a backup to a certified air cleaner.
Check the filter during and after a smoke event. Smoke loads a filter much faster than dust. EPA's guidance is to replace it when it looks dark brown or grey or smells like smoke, which can be well before the usual interval, so keep spares on hand. Pleated filters capture particles, while smoke smell comes from gases; for odours, Filterbuy also carries an Odour Eliminator line.
What Filterbuy Learned Mapping Smoke Across Durham Region
After building smoke pages for Oshawa, Whitby, Ajax, and Toronto, two lessons stand out: Durham Region's readings rest on one monitor in north Oshawa, and the 2023, 2025, and 2026 smoke events lined up to the northwest. Our three-check routine:
1. Map: look northwest on the live map for large fire clusters in northwestern Ontario and the Prairies.
2. Measure: check the Oshawa AQHI forecast and the latest hourly reading from Station 45027.
3. Move: at AQI 100 or higher, switch to MERV 13, set the fan to On, run HEPA air cleaners in occupied rooms, and close up.
"When haze rolls in over Lake Ontario, most people in Oshawa assume the fire is close. It's usually hundreds of kilometres away, and the map shows it. I treat a big fire cluster to the northwest as a heads-up to get a fresh MERV 13 filter in and the air cleaners ready."
-Michelle Wan, Brand Manager and Air Quality Writer, Filterbuy Canada
Filterbuy carries more than 600 filter sizes, including custom sizes, with free shipping to Canada. Get MERV 13 in before fire season returns on 1 April, and keep a spare with an air filter subscription you can edit, skip, or cancel anytime, or find your air filter size now.
Frequently Asked Questions
Is there a wildfire in Oshawa right now?
Check the live map at the top of this page. Oshawa is outside Ontario's forest fire region; report any local fire by calling 911.
Why is it smoky in Oshawa when no fires are nearby?
Wildfire smoke travels long distances on the wind. Recent smoke here came from fires about 590 to 2,040 km away.
Where can I check Oshawa's air quality today?
Use the federal Oshawa AQHI forecast and Air Quality Ontario Station 45027, alongside the live map.
Can I have a backyard fire in Oshawa?
Generally, no. By-law 73-2012 bans most open-air burning; certified propane or natural gas appliances are allowed.
What furnace filter is best for wildfire smoke in Oshawa?
MERV 13. It's the tier Filterbuy recommends for smoke, and the EPA recommends MERV 13 or higher in central systems during smoke events. Filterbuy Canada carries MERV 13 in standard and custom sizes; match the size on your current filter.
Can I put a HEPA filter in my furnace?
No. True HEPA filters are built for portable air cleaners, not residential furnace slots. Use MERV 13 in the furnace and HEPA in a portable unit.
Glossary
AQHI (Air Quality Health Index): Canada's 1 to 10+ air pollution health risk scale.
U.S. AQI (Air Quality Index): The U.S. 0 to 500 scale shown on the live map.
PM2.5: Airborne particles 2.5 micrometres or smaller, the main health concern in wildfire smoke.
Forest fire region: Northern Ontario, where the province manages wildland fires.
HMS (Hazard Mapping System): The NOAA/NESDIS program that traces smoke plumes from satellite imagery.
MERV (Minimum Efficiency Reporting Value): A 1 to 16 rating of how well an HVAC filter captures particles.
MERV 13: The high-efficiency filter tier Filterbuy recommends for wildfire smoke, labelled Optimal.
HEPA (high-efficiency particulate air): A filter standard used in portable air cleaners, not residential furnaces.
CADR (Clean Air Delivery Rate): A portable air cleaner's rated output of cleaned air; use the smoke CADR.
Haversine distance: Straight-line distance across the Earth's surface between two points.