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St. Catharines air right now

Low riskAQHI 2

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

2
AQHI now
5
PM2.5 · µg/m³
3 cleaner spots within 3 hr drive

Where are you?

Search covers Canada and the United States.

The better move within a 3-hour drive

Dates

Dates follow you into hotel searches. Live inventory is confirmed by the provider.

Ellicottville looks like the better move.68% cleaner air with a verified 1 h 50 min road trip. Rankings balance cleaner air with trip ease.

Every town is also available in the ranked list.
St. Catharines Clean · PM2.5 0–5 Good · 5–9 Elevated · 9–15 Polluted · 15–35 Unhealthy · 35–55 Severe · 55+
Top pick
Port Perry
Cel-shaded illustration of Port Perry
AQHI 1
#1Port PerryChecking road route

Ontario· Low risk

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

86% cleaner than home — pack the car.

PM2.5 is 0.7 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.7/22 × 7 = 0.2 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

4.3 µg/m³ less fine-particle pollution than St. Catharines right now

86% 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
Port Hope
Cel-shaded illustration of Port Hope
AQHI 1
#2Port HopeChecking road route

Ontario· Low risk

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

80% cleaner than home — pack the car.

PM2.5 is 1 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 1/22 × 7 = 0.3 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

4 µg/m³ less fine-particle pollution than St. Catharines right now

80% 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
Ellicottville
Cel-shaded illustration of Ellicottville
AQI 9
#3Ellicottville~1 h 50 min drive

New York· Good

Enchanted Mountains ski-and-hike town in western New York, a walkable four-season base with cool upland air and abundant lodging.

68% cleaner than home — pack the car.

PM2.5 is 1.6 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 1.6/22 × 7 = 0.5 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

3.4 µg/m³ less fine-particle pollution than St. Catharines right now

68% 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 Dover
Cel-shaded illustration of Port Dover
AQI 9
#4Port Dover~1 h 45 min drive

Ontario· Good

Lake Erie beach town with a palm-tree pier vibe and steady south-shore lake air.

66% cleaner than home — pack the car.

PM2.5 is 1.7 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 1.7/22 × 7 = 0.5 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

3.3 µg/m³ less fine-particle pollution than St. Catharines right now

66% 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
Still smoky
Kitchener-Waterloo
Cel-shaded illustration of Kitchener-Waterloo
AQHI 1
#5Kitchener-Waterloo~1 h 45 min drive

Ontario· Low risk

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

About the same air — still smoky.

PM2.5 is 3 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 3/22 × 7 = 1.0 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →
40% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 1: Low risk (Kitchener station)

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

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

Directions
Still smoky
St. Jacobs
Cel-shaded illustration of St. Jacobs
AQI 17
#6St. Jacobs~1 h 55 min drive

Ontario· Good

Mennonite-country village and market just outside Waterloo, an easy countryside reset.

About the same air — still smoky.

PM2.5 is 3 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 3/22 × 7 = 1.0 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →
40% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 1: Low risk (Kitchener station)

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

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

Directions
Still smoky
Buffalo
Cel-shaded illustration of Buffalo
AQI 22
#7Buffalo~40 min drive

New York· Good

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

About the same air — still smoky.

PM2.5 is 4 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 4/22 × 7 = 1.3 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →
20% cleaner airChecking trip easeChecking nearby staysChecking today's weather

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

PM2.5 from the Buffalo monitor.

Directions
Still smoky
Hamilton
Cel-shaded illustration of Hamilton
AQHI 1
#8Hamilton~50 min drive

Ontario· Low risk

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

About the same air — still smoky.

PM2.5 is 4 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 4/22 × 7 = 1.3 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →
20% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 1: Low risk (Hamilton Downtown station)

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

AQHI from the Hamilton Downtown station. PM2.5 from the Hamilton Mountain monitor.

Directions
Still smoky
Mississauga
Cel-shaded illustration of Mississauga
AQHI 1
#9Mississauga~1 h 10 min drive

Ontario· Low risk

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

About the same air — still smoky.

PM2.5 is 4 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 4/22 × 7 = 1.3 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →
20% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 1: Low risk (Mississauga station)

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

AQHI from the Mississauga station. PM2.5 from the Misssissauga monitor.

Directions
Still smoky
Brantford
Cel-shaded illustration of Brantford
AQHI 1
#10BrantfordChecking 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.

About the same air — still smoky.

PM2.5 is 4 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 4/22 × 7 = 1.3 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →
20% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 1: Low risk (Brantford station)

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

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

Directions
Still smoky
Brampton
Cel-shaded illustration of Brampton
AQHI 1
#11Brampton~1 h 20 min drive

Ontario· Low risk

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

About the same air — still smoky.

PM2.5 is 4 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 4/22 × 7 = 1.3 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →
20% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 1: Low risk (Brampton station)

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

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

Directions
Still smoky
Guelph
Cel-shaded illustration of Guelph
AQHI 1
#12Guelph~1 h 35 min drive

Ontario· Low risk

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

About the same air — still smoky.

PM2.5 is 4 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 4/22 × 7 = 1.3 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →
20% cleaner airChecking trip easeChecking nearby staysChecking today's weather

AQHI 1: Low risk (Guelph station)

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

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

Directions
Thornbury
Cel-shaded illustration of Thornbury
AQI 2
#13ThornburyChecking road route

Ontario· Good

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

94% cleaner than home — pack the car.

PM2.5 is 0.3 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.3/22 × 7 = 0.1 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

4.7 µg/m³ less fine-particle pollution than St. Catharines right now

94% 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
#14MeafordChecking road route

Ontario· Good

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

90% cleaner than home — pack the car.

PM2.5 is 0.5 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0.5/22 × 7 = 0.2 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

4.5 µg/m³ less fine-particle pollution than St. Catharines 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
Lakefield
Cel-shaded illustration of Lakefield
AQHI 1
#15LakefieldChecking road route

Ontario· Low risk

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

80% cleaner than home — pack the car.

PM2.5 is 1 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 1/22 × 7 = 0.3 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

4 µg/m³ less fine-particle pollution than St. Catharines right now

80% 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
Buckhorn
Cel-shaded illustration of Buckhorn
AQHI 1
#16BuckhornChecking road route

Ontario· Low risk

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

80% cleaner than home — pack the car.

PM2.5 is 1 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 1/22 × 7 = 0.3 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

4 µg/m³ less fine-particle pollution than St. Catharines right now

80% 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
Cobourg
Cel-shaded illustration of Cobourg
AQI 6
#17Cobourg~2 h 50 min drive

Ontario· Good

Victorian lakefront town with a long sandy beach an easy hop east of the GTA.

78% cleaner than home — pack the car.

PM2.5 is 1.1 µg/m³ here vs 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 1.1/22 × 7 = 0.4 here; 5/22 × 7 = 1.6 at home.A long-term health-risk equivalence, not literal smoking.See how we work it out →

3.9 µg/m³ less fine-particle pollution than St. Catharines right now

78% 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
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 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0/22 × 7 = 0 here; 5/22 × 7 = 1.6 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 St. Catharines 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
#19Killarney~6 h 55 min drive

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 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0/22 × 7 = 0 here; 5/22 × 7 = 1.6 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 St. Catharines 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)~8 h 5 min drive

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 5 back home.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at these levels: 0/22 × 7 = 0 here; 5/22 × 7 = 1.6 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 St. Catharines 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 2: Low risk (St. Catharines)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 qualityMarkham air qualityMississauga air qualityNorth Bay air qualityOshawa air qualityOttawa air qualityPeterborough air qualitySault Ste. Marie 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 qualityAkron air qualityPittsburgh air qualityCanton air qualityDetroit air qualityScranton air qualityHarrisburg air quality

What this means · St. Catharines

Low risk

AQHI 2

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 5 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.

5 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.

1.6/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 5 µg/m³.Berkeley Earth: 22 µg/m³ for 24 h ≈ 1 cigarette.A week at this level: 5/22 × 7 = 1.6 cigarettes.A long-term health-risk equivalence, not literal smoking.See how we work it out →
See the full method →