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Markham air right now

Low riskAQHI 1

Markham’s five-day smoke forecast shows the current index and the clearest time ahead.

1
AQHI now
6
PM2.5 · µg/m³
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Markham Clean · PM2.5 0–5 Good · 5–9 Elevated · 9–15 Polluted · 15–35 Unhealthy · 35–55 Severe · 55+
Top pick
Midland
Cel-shaded illustration of Midland
AQI 1
#1MidlandChecking road route

Ontario· Good

Harbour town on Georgian Bay’s 30,000 Islands shore, with bay cruises and shoreline trails.

97% cleaner than home — pack the car.

PM2.5 is 0.2 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.2/22 × 7 = 0.1 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.8 µg/m³ less fine-particle pollution than Markham right now

97% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:12 p.m. EDT

PM2.5 is estimated for this town.

Directions
Collingwood
Cel-shaded illustration of Collingwood
AQI 2
#2CollingwoodChecking road route

Ontario· Good

Georgian Bay harbour town at the base of the Niagara Escarpment, with bay breezes and plenty of hotels and rentals.

95% cleaner than home — pack the car.

PM2.5 is 0.3 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.3/22 × 7 = 0.1 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.7 µg/m³ less fine-particle pollution than Markham right now

95% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:12 p.m. EDT

PM2.5 is estimated for this town.

Directions
The Blue Mountains
Cel-shaded illustration of The Blue Mountains
AQI 2
#3The Blue MountainsChecking road route

Ontario· Good

Resort village on Georgian Bay with escarpment elevation, a walkable pedestrian base and year-round lodging.

95% cleaner than home — pack the car.

PM2.5 is 0.3 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.3/22 × 7 = 0.1 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.7 µg/m³ less fine-particle pollution than Markham right now

95% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:12 p.m. EDT

PM2.5 is estimated for this town.

Directions
Thornbury
Cel-shaded illustration of Thornbury
AQI 2
#4ThornburyChecking road route

Ontario· Good

Georgian Bay apple-country village near Collingwood, with a walkable harbourfront and bay air.

95% cleaner than home — pack the car.

PM2.5 is 0.3 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.3/22 × 7 = 0.1 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.7 µg/m³ less fine-particle pollution than Markham right now

95% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:27 p.m. EDT

PM2.5 is estimated for this town. No AQHI station is close enough.

Directions
Honey Harbour
Cel-shaded illustration of Honey Harbour
AQI 2
#5Honey HarbourChecking road route

Ontario· Good

Gateway to Georgian Bay's 30,000 Islands, with open-bay air and marina-side lodging.

95% cleaner than home — pack the car.

PM2.5 is 0.3 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.3/22 × 7 = 0.1 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.7 µg/m³ less fine-particle pollution than Markham right now

95% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:27 p.m. EDT

PM2.5 is estimated for this town. No AQHI station is close enough.

Directions
Meaford
Cel-shaded illustration of Meaford
AQI 3
#6MeafordChecking road route

Ontario· Good

Georgian Bay orchard town near Collingwood, with bay-air exposure and a walkable harbourfront.

92% cleaner than home — pack the car.

PM2.5 is 0.5 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.5/22 × 7 = 0.2 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.5 µg/m³ less fine-particle pollution than Markham right now

92% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:27 p.m. EDT

PM2.5 is estimated for this town. No AQHI station is close enough.

Directions
Gravenhurst
Cel-shaded illustration of Gravenhurst
AQI 3
#7GravenhurstChecking road route

Ontario· Good

Gateway to Muskoka on Lake Muskoka’s steamship wharf, the closest cottage country to the GTA.

90% cleaner than home — pack the car.

PM2.5 is 0.6 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.6/22 × 7 = 0.2 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.4 µg/m³ less fine-particle pollution than Markham right now

90% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:12 p.m. EDT

PM2.5 is estimated for this town.

Directions
Bala
Cel-shaded illustration of Bala
AQI 3
#8BalaChecking road route

Ontario· Good

Falls-side Muskoka village where the Moon River tumbles through, an easy lake-country escape.

90% cleaner than home — pack the car.

PM2.5 is 0.6 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.6/22 × 7 = 0.2 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.4 µg/m³ less fine-particle pollution than Markham right now

90% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:27 p.m. EDT

PM2.5 is estimated for this town. No AQHI station is close enough.

Directions
Port Perry
Cel-shaded illustration of Port Perry
AQHI 1
#9Port PerryChecking road route

Ontario· Low risk

Lake Scugog harbour town northeast of Toronto, an easy open-water escape with a historic Main Street.

88% cleaner than home — pack the car.

PM2.5 is 0.7 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.7/22 × 7 = 0.2 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.3 µg/m³ less fine-particle pollution than Markham right now

88% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 1: Low risk (Oshawa station)

Observed Aug 23, 6:27 p.m. EDT

AQHI from the Oshawa station. PM2.5 is estimated for this town.

Directions
Fenelon Falls
Cel-shaded illustration of Fenelon Falls
AQI 4
#10Fenelon FallsChecking road route

Ontario· Good

The “Jewel of the Kawarthas,” a falls-side village on the Trent-Severn Waterway.

87% cleaner than home — pack the car.

PM2.5 is 0.8 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.8/22 × 7 = 0.3 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.2 µg/m³ less fine-particle pollution than Markham right now

87% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:12 p.m. EDT

PM2.5 is estimated for this town.

Directions
Port Hope
Cel-shaded illustration of Port Hope
AQHI 1
#11Port HopeChecking road route

Ontario· Low risk

Lake Ontario heritage town near Cobourg, with a walkable historic Main Street and open-water air.

83% cleaner than home — pack the car.

PM2.5 is 1 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 1/22 × 7 = 0.3 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5 µg/m³ less fine-particle pollution than Markham right now

83% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 1: Low risk (Peterborough station)

Observed Aug 23, 5:00 p.m. EDT

AQHI from the Peterborough station. PM2.5 from the Peterborough monitor.

Directions
Peterborough
Cel-shaded illustration of Peterborough
AQHI 1
#12PeterboroughChecking road route

Ontario· Low risk

A major Ontario city with broad lodging options and live air-quality readings for comparison when smoke shifts across the region.

83% cleaner than home — pack the car.

PM2.5 is 1 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 1/22 × 7 = 0.3 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5 µg/m³ less fine-particle pollution than Markham right now

83% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 1: Low risk (Peterborough station)

Observed Aug 23, 5:00 p.m. EDT

AQHI from the Peterborough station. PM2.5 from the Peterborough monitor.

Directions
Wiarton
Cel-shaded illustration of Wiarton
AQI 2
#13WiartonChecking road route

Ontario· Good

Bruce Peninsula harbour town on Colpoys Bay, with Georgian Bay air and small-town lodging.

93% cleaner than home — pack the car.

PM2.5 is 0.4 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.4/22 × 7 = 0.1 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.6 µg/m³ less fine-particle pollution than Markham right now

93% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:27 p.m. EDT

PM2.5 is estimated for this town. No AQHI station is close enough.

Directions
Owen Sound
Cel-shaded illustration of Owen Sound
AQI 3
#14Owen SoundChecking road route

Ontario· Good

Georgian Bay port city at the base of the Bruce Peninsula, with bay air and a broad hotel base.

92% cleaner than home — pack the car.

PM2.5 is 0.5 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.5/22 × 7 = 0.2 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.5 µg/m³ less fine-particle pollution than Markham right now

92% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:27 p.m. EDT

PM2.5 is estimated for this town. No AQHI station is close enough.

Directions
Sauble Beach
Cel-shaded illustration of Sauble Beach
AQI 3
#15Sauble BeachChecking road route

Ontario· Good

11 km of sandy Lake Huron shoreline where westerly lake winds usually keep the air moving.

92% cleaner than home — pack the car.

PM2.5 is 0.5 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.5/22 × 7 = 0.2 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.5 µg/m³ less fine-particle pollution than Markham right now

92% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:12 p.m. EDT

PM2.5 is estimated for this town.

Directions
Port Carling
Cel-shaded illustration of Port Carling
AQI 3
#16Port CarlingChecking road route

Ontario· Good

Hub of the Muskoka Lakes chain, with open-water air linking Lake Rosseau and Lake Muskoka.

90% cleaner than home — pack the car.

PM2.5 is 0.6 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.6/22 × 7 = 0.2 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.4 µg/m³ less fine-particle pollution than Markham right now

90% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:27 p.m. EDT

PM2.5 is estimated for this town. No AQHI station is close enough.

Directions
Kearney
Cel-shaded illustration of Kearney
AQI 4
#17KearneyChecking road route

Ontario· Good

Small village at Algonquin Park's northwest edge, deep in near-north lake-and-forest country.

88% cleaner than home — pack the car.

PM2.5 is 0.7 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.7/22 × 7 = 0.2 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

5.3 µg/m³ less fine-particle pollution than Markham right now

88% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:27 p.m. EDT

PM2.5 is estimated for this town. No AQHI station is close enough.

Directions
Lion's Head
Cel-shaded illustration of Lion's Head
AQI 0
#18Lion's HeadChecking road route

Ontario· Good

Bruce Peninsula village on a limestone-cliff harbour, wrapped in open Georgian Bay air.

100% cleaner than home — pack the car.

PM2.5 is 0 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0/22 × 7 = 0 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

6 µg/m³ less fine-particle pollution than Markham right now

100% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:27 p.m. EDT

PM2.5 is estimated for this town. No AQHI station is close enough.

Directions
Killarney
Cel-shaded illustration of Killarney
AQI 0
#19KillarneyChecking road route

Ontario· Good

Remote village beside Killarney Park’s white quartzite ridges, on the north channel of Georgian Bay.

100% cleaner than home — pack the car.

PM2.5 is 0 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0/22 × 7 = 0 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

6 µg/m³ less fine-particle pollution than Markham right now

100% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:12 p.m. EDT

PM2.5 is estimated for this town.

Directions
Little Current (Manitoulin Island)
Cel-shaded illustration of Little Current (Manitoulin Island)
AQI 0
#20Little Current (Manitoulin Island)Checking road route

Ontario· Good

Manitoulin’s main harbour town, on the world’s largest freshwater island and surrounded by Huron’s North Channel.

100% cleaner than home — pack the car.

PM2.5 is 0 µg/m³ here vs 6 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0/22 × 7 = 0 here; 6/22 × 7 = 1.9 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

6 µg/m³ less fine-particle pollution than Markham right now

100% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Aug 23, 6:12 p.m. EDT

PM2.5 is estimated for this town.

Directions
Bad week ahead? Check the 7-day outlook — if it won’t clear, book the trip

7-day outlook

Plan the next seven days

Pick a day, or compare the whole week. Weather is forecast; air quality is the latest available reading.

Loading the week…

Finding the nicest days and reachable cities.

AQHI 1: Low risk (Toronto North)Observed Aug 23, 5:00 p.m. EDTLast scan Aug 23, 6:27 p.m. EDT · 49 min ago

Why live rankings? Smoke plumes are patchy and shift with the wind, so no direction is reliably cleaner. This list is recalculated from live PM2.5 every hour — and if everything nearby is smoky, it says so.

How we work this out →

Browse all 200 cities by province & state →

More air-quality pages in Ontario →
Barrie air qualityBelleville air qualityBrampton air qualityBrantford air qualityGreater Sudbury air qualityGuelph air qualityHamilton air qualityKingston air qualityKitchener-Waterloo air qualityLondon air qualityMississauga air qualityNorth Bay air qualityOshawa air qualityOttawa air qualityPeterborough air qualitySault Ste. Marie air qualitySt. Catharines air qualityThunder Bay air qualityToronto air qualityVaughan air qualityWindsor air quality
Air quality in nearby cities →
Buffalo air qualityRochester air qualityErie air qualitySyracuse air qualityYoungstown air qualityCleveland air qualityDetroit air qualityAkron air qualityCanton air qualityPittsburgh air qualityScranton air qualityToledo air quality

What this means · Markham

Low risk

AQHI 1

AQHI = Air Quality Health Index

Typical person. Ideal air for usual outdoor plans.

Kids, seniors, heart or lung conditions. People with heart or lung conditions can usually keep their normal outdoor routine.

Particles here are 6 µg/m³ (Good).

Act two · Fine particles only

Where PM2.5 lands

This bar is smoke and fine particles (PM2.5) only — not the full AQHI mix. Left is cleaner air; right is heavier particle pollution. Today's particles sit in Good.

6 µg/m³
Clean · 0Smoky · 40Severe · 80+

Act three · Particle ladder

What each PM2.5 rung feels like

  • 0–3µg/m³Natural. About as clean as outdoor air realistically gets.
  • 3–5µg/m³Clean. Crisp, destination-worthy air.
  • 5–9µg/m³Good. Clean city air; most people will not notice anything today.
  • 9–15µg/m³Elevated. Usually no big deal today; sensitive lungs may notice hard exercise.
  • 15–35µg/m³Polluted. Smoke or traffic pollution is now worth acting on.
  • 35–55µg/m³Unhealthy. Symptoms become more likely, especially with asthma or heart disease.
  • 55+µg/m³Severe. Everyone should reduce exposure and clean the indoor air.

Act four · Felt number

Cigarettes a week

A secondary feel for the particle load only — not a medical claim, and not a substitute for AQHI.

1.9/wk

What is PM2.5?

Fine particles about 30× thinner than a human hair — small enough to slip through your lungs and into your bloodstream. We measure them inµg/m³: micrograms of particle mass in a cubic metre of air.

The math

PM2.5 here is 6 µg/m³.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at this level: 6/22 × 7 = 1.9 cigarettes.A long-term health-risk equivalence, not literal smoking.See how we work it out →
See the full method →