What is the air quality in Alliston today?

The current Air Quality Index (AQI) in Alliston is 16 (Good). PM2.5 concentration is 3.87 µg/m³.

What is the temperature in Alliston right now?

The current temperature in Alliston is 4.9°C (feels like 1.0°C). Humidity is 56.9% and wind speed is 19.0 km/h.

Is it safe to go outside in Alliston?

Air quality is satisfactory. Enjoy outdoor activities. The UV Index is 0.0 (Low).

Air Quality in Alliston, Canada

Partly Cloudy

4.9°C · 56.9% humidity

4.9°

Feels 1.0°

Good

Air quality is satisfactory. Enjoy outdoor activities.

1 station

Nearby Monitoring Stations

AQI Forecast

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Air Quality Index Trend

46h · 8 stn

View full history →

Alliston's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration.

56.9%

Humidity

19.0 km/h

Wind SSE

1028.5 hPa

Pressure

0.0

UV Low

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5

3.87 µg/m³

PM10▲

27.4 µg/m³

050100150200300500

What is the weather forecast for Alliston?

Temperature & Precipitation

PM2.5 Trend

46h · 8 stations

PM2.53.87 µg/m³ ✓ WHO

Good

PM1027.4 µg/m³

Good

UV INDEX0.0

Low

Station readings (1 station within 25 km)

3.87

Median

3.87

Average

3.87

Low

3.87

High

PM2.5 µg/m³ · Model: 8.2 · Bias: +4.3

What is the 7-day forecast for Alliston?

10-20

7.4° 3.1°

10-21

17.3° 4.3°

10-22

12.7° 4.6°

0.06 mm

10-23

12.8° 1.2°

0.56 mm

10-24

15.5° 1.4°

1.31 mm

10-25

12.8° 3.4°

2.06 mm

10-26

8.5° 3.0°

11.5 mm

Both models agree Avg diff: 4.1°C

Where are air quality stations near Alliston?

NASA GSFC Rutgers Calib. N15

11.3 km PM2.5: 3.9 µg/m³

What cities are near Alliston?

19 Innisfil 19 Bolton 28 Orangeville 20 Barrie 28 Caledon 21 Keswick 24 Newmarket 24 East Gwillimbury 24 Aurora 30 Wasaga Beach

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ModerateAQI > 50 Unhealthy for Sensitive GroupsAQI > 100 UnhealthyAQI > 150 Very UnhealthyAQI > 200

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Data sources: AQI from ground-level monitoring stations via AQICN. Weather forecast from ECMWF (IFS & CAMS models). AQI calculated using US EPA standard. Updated 2026-10-20T23:40 UTC.