NASA GSFC Rutgers Calib. N15 Air Quality

Monitoring Station · Alliston, Canada
55
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Last Reading

Nearby Monitoring Stations

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AQI Forecast Calibrated
56 6pm
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57 9pm
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55 12am
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55 3am
57
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57 6am
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Station readings
56
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CAMS model adj +30
27
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Air Quality Forecast (24h)

PM2.513.8 µg/m³ ✓ WHO
Moderate
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Nearby Monitoring Stations

55
Barrie, Ontario
17.9 km PM2.5: 14.0 µg/m³
43
Barrie, Ontario, Canada
17.9 km PM2.5: 10.3 µg/m³
34
Barrie, Ontario, Canada
17.9 km PM2.5: 8.2 µg/m³
17
Newmarket, Ontario, Canada
31.6 km PM2.5: 4.1 µg/m³
42
Newmarket, Ontario, Canada
31.6 km PM2.5: 10.1 µg/m³

Nearby Cities

55 Alliston 63 Innisfil 64 Barrie 59 Keswick 38 East Gwillimbury 38 Newmarket 38 Aurora 35 Wasaga Beach 33 Bolton

Station data from AQICN. AQI forecast from ECMWF CAMS. AQI calculated using US EPA standard. Updated 2026-07-21T21:38 UTC.