NASA GSFC Rutgers Calib. N15 Air Quality

Monitoring Station · Alliston, Canada
52
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
Last Reading

Nearby Monitoring Stations

GoodModerateUSGUnhealthyVery UnhealthyHazardous
AQI Forecast Calibrated
55 7pm
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57 10pm
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55 1am
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57 4am
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Station readings
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52
CAMS model adj +30
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Air Quality Forecast (24h)

PM2.512.7 µg/m³ ✓ WHO
Moderate
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Nearby Monitoring Stations

53
Barrie, Ontario
17.9 km PM2.5: 13.0 µg/m³
45
Barrie, Ontario, Canada
17.9 km PM2.5: 10.8 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
55
Newmarket, Ontario, Canada
31.6 km PM2.5: 14.0 µg/m³

Nearby Cities

52 Alliston 54 Innisfil 54 Barrie 50 Keswick 40 East Gwillimbury 40 Newmarket 40 Aurora 35 Wasaga Beach 34 Bolton

Station data from AQICN. AQI forecast from ECMWF CAMS. AQI calculated using US EPA standard. Updated 2026-07-21T22:04 UTC.