What is the air quality in Alliston today?

The current Air Quality Index (AQI) in Alliston is 56 (Moderate). PM2.5 concentration is 14.71 µg/m³.

What is the temperature in Alliston right now?

The current temperature in Alliston is 26.8°C (feels like 26.8°C). Humidity is 54.2% and wind speed is 32.4 km/h.

Air Quality in Alliston, Canada

Partly Cloudy

26.8°C · 54.2% humidity

26.8°

Feels 26.8°

Moderate

Unusually sensitive people should consider reducing prolonged outdoor exertion.

1 station

Nearby Monitoring Stations

AQI Forecast

27 10am

56 1pm

36 4pm

31 7pm

26 10pm

28 1am

25 4am

25 7am

Air Quality Index Trend

48h · 1 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.

54.2%

Humidity

32.4 km/h

Wind ENE

1014.8 hPa

Pressure

12.9

UV Extreme

GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5

14.71 µg/m³

PM10▲

84.3 µg/m³

050100150200300500

What is the weather forecast for Alliston?

Temperature & Precipitation

PM2.5 Trend

48h · 1 station

PM2.514.71 µg/m³ ✓ WHO

Moderate

PM1084.3 µg/m³

Moderate

UV INDEX12.9

Extreme

Station readings (1 station within 25 km)

14.71

Median

14.71

Average

14.71

Low

14.71

High

PM2.5 µg/m³ · Model: 40.72 · Bias: +26.0

What is the 7-day forecast for Alliston?

07-21

26.8° 21.7°

14.56 mm

07-22

24.3° 17.0°

0.62 mm

07-23

18.5° 15.5°

0.5 mm

07-24

21.7° 15.6°

07-25

23.7° 13.6°

1.63 mm

07-26

25.6° 18.7°

3.62 mm

07-27

28.8° 19.2°

0.13 mm

Both models agree Avg diff: 3.1°C

Where are air quality stations near Alliston?

NASA GSFC Rutgers Calib. N15

11.3 km PM2.5: 14.7 µg/m³

What cities are near Alliston?

66 Innisfil 57 Bolton 71 Orangeville 71 Barrie 71 Caledon 71 Keswick 114 Newmarket 114 East Gwillimbury 57 Aurora 76 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 2026-07-21T17:17 UTC.