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Nothing cleaner nearby

Markham is breathing 6.0 cigarettes a week

19
PM2.5 µg/m³
69
AQI
2.3
Cleanest in reach · 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
Port Hope
Cel-shaded illustration of Port Hope
#1Port HopePM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

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

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 3: Low risk (Peterborough station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Peterborough station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Peterborough
Cel-shaded illustration of Peterborough
#2PeterboroughPM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

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

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 3: Low risk (Peterborough station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Peterborough station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Bobcaygeon
Cel-shaded illustration of Bobcaygeon
#3BobcaygeonPM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

Kawartha canal town spread across three islands between Pigeon and Sturgeon lakes.

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 3: Low risk (Peterborough station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Peterborough station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Lakefield
Cel-shaded illustration of Lakefield
#4LakefieldPM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

Kawartha Lakes village on the Trent-Severn Waterway, an easy lake-country escape from Toronto.

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 3: Low risk (Peterborough station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Peterborough station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Buckhorn
Cel-shaded illustration of Buckhorn
#5BuckhornPM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

Kawarthas village on Buckhorn Lake, an open-water base with cottage rentals and marinas.

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 3: Low risk (Peterborough station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Peterborough station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Minden
Cel-shaded illustration of Minden
#6MindenPM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

Haliburton Highlands village on the Gull River, surrounded by hundreds of lakes and forest.

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 2: Low risk (Dorset station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Dorset station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Meaford
Cel-shaded illustration of Meaford
#7MeafordPM2.5 12.8Checking road routesaves 2.0 cigs/wk

Ontario· PM2.5 12.8 µg/m³

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

33% cleaner than home — pack the car.

PM2.5 is 12.8 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 12.8/22 × 7 = 4.1 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

33% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Jul 27, 8:27 p.m. EDT

PM2.5 is modelled for this town — no monitoring station is close enough for a live AQHI.

HotelsRentalsDirections
Brampton
Cel-shaded illustration of Brampton
#8BramptonPM2.5 14Checking road routesaves 1.6 cigs/wk

Ontario· PM2.5 14 µg/m³

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

26% cleaner than home — pack the car.

PM2.5 is 14 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 14/22 × 7 = 4.5 here; 19/22 × 7 = 6.0 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

26% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 3: Low risk (Brampton station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Brampton station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Mississauga
Cel-shaded illustration of Mississauga
#9MississaugaPM2.5 14Checking road routesaves 1.6 cigs/wk

Ontario· PM2.5 14 µg/m³

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

26% cleaner than home — pack the car.

PM2.5 is 14 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 14/22 × 7 = 4.5 here; 19/22 × 7 = 6.0 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

26% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 2: Low risk (Mississauga station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Mississauga station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Niagara-on-the-Lake
Cel-shaded illustration of Niagara-on-the-Lake
#10Niagara-on-the-LakePM2.5 14Checking road routesaves 1.6 cigs/wk

Ontario· PM2.5 14 µg/m³

Wine-country town where the Niagara River meets Lake Ontario, dense with inns and B&Bs.

26% cleaner than home — pack the car.

PM2.5 is 14 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 14/22 × 7 = 4.5 here; 19/22 × 7 = 6.0 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

26% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 3: Low risk (St. Catharines station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the St. Catharines station; PM2.5 is modelled for this town.

HotelsRentalsDirections
St. Catharines
Cel-shaded illustration of St. Catharines
#11St. CatharinesPM2.5 14Checking road routesaves 1.6 cigs/wk

Ontario· PM2.5 14 µg/m³

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

26% cleaner than home — pack the car.

PM2.5 is 14 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 14/22 × 7 = 4.5 here; 19/22 × 7 = 6.0 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

26% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 3: Low risk (St. Catharines station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the St. Catharines station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Hamilton
Cel-shaded illustration of Hamilton
#12HamiltonPM2.5 14Checking road routesaves 1.6 cigs/wk

Ontario· PM2.5 14 µg/m³

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

26% cleaner than home — pack the car.

PM2.5 is 14 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 14/22 × 7 = 4.5 here; 19/22 × 7 = 6.0 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

26% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 3: Low risk (Hamilton Downtown station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Hamilton Downtown station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Bracebridge
Cel-shaded illustration of Bracebridge
#13BracebridgePM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

Waterfall town in the heart of Muskoka with a deep bench of cottages and resorts.

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 2: Low risk (Dorset station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Dorset station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Baysville
Cel-shaded illustration of Baysville
#14BaysvillePM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

Muskoka village on the Lake of Bays, with open-water air and a small stock of lodges.

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 2: Low risk (Dorset station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Dorset station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Haliburton
Cel-shaded illustration of Haliburton
#15HaliburtonPM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

Highlands village surrounded by hundreds of lakes and a large cottage-rental market.

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 2: Low risk (Dorset station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Dorset station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Dorset
Cel-shaded illustration of Dorset
#16DorsetPM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

Village between Lake of Bays and Algonquin Park, deep in Muskoka's forested lake country.

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 2: Low risk (Dorset station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Dorset station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Huntsville
Cel-shaded illustration of Huntsville
#17HuntsvillePM2.5 10Checking road routesaves 2.9 cigs/wk

Ontario· PM2.5 10 µg/m³

Muskoka’s biggest town, ringed by lakes and resorts on the edge of Algonquin Park.

47% cleaner than home — pack the car.

PM2.5 is 10 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 10/22 × 7 = 3.2 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

47% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 2: Low risk (Dorset station)

Observed Jul 27, 7:00 p.m. EDT

AQHI from the Dorset station; PM2.5 is modelled for this town.

HotelsRentalsDirections
Glen Arbor
Cel-shaded illustration of Glen Arbor
#18Glen ArborPM2.5 2.3Checking road routesaves 5.3 cigs/wk

Michigan· PM2.5 2.3 µg/m³

Village beside Sleeping Bear Dunes on Lake Michigan, wrapped in lakeshore air, with cottages and inns.

88% cleaner than home — pack the car.

PM2.5 is 2.3 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 2.3/22 × 7 = 0.7 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

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

Observed Jul 27, 8:27 p.m. EDT

PM2.5 is modelled for this town — no monitoring station is close enough for a live AQHI.

HotelsRentalsDirections
Tobermory
Cel-shaded illustration of Tobermory
#19TobermoryPM2.5 3.3Checking road routesaves 5.0 cigs/wk

Ontario· PM2.5 3.3 µg/m³

Harbour village at the tip of the Bruce Peninsula, wrapped in open Lake Huron and Georgian Bay water with steady onshore breezes.

83% cleaner than home — pack the car.

PM2.5 is 3.3 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 3.3/22 × 7 = 1.1 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

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

Observed Jul 27, 8:12 p.m. EDT

PM2.5 is modelled for this town — no monitoring station is close enough for a live AQHI.

HotelsRentalsDirections
Ludington
Cel-shaded illustration of Ludington
#20LudingtonPM2.5 3.4Checking road routesaves 5.0 cigs/wk

Michigan· PM2.5 3.4 µg/m³

Lake Michigan port town with a long public beach, swept by onshore lake wind, with harborside inns.

82% cleaner than home — pack the car.

PM2.5 is 3.4 µg/m³ here vs 19 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 3.4/22 × 7 = 1.1 here; 19/22 × 7 = 6.0 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

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

82% cleaner airChecking trip easeChecking nearby staysChecking today's weather

Observed Jul 27, 8:27 p.m. EDT

PM2.5 is modelled for this town — no monitoring station is close enough for a live AQHI.

HotelsRentalsDirections
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 3: Low risk (Toronto North)Observed Jul 27, 7:00 p.m. EDTLast scan Jul 27, 8:27 p.m. EDT · 53 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 →

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What this means · Markham

Oof.

6.0cigarettes

per week, if this air holds

Act two · The scale

Where today lands

From a crisp horizon to smoke you can taste — here’s your reading on it.

19 µg/m³
CrispSome smokeHeavy smoke

Act three · The ladder

What each 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 · The fine print

The receipts

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 19 µg/m³.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at this level: 19/22 × 7 = 6.0 cigarettes.A long-term health-risk equivalence, not literal smoking.See how we work it out →
See the full method →