Ambient StateMarkham
7°
Mostly Cloudy
High / Low15° / 2°
Wind Vector9 km/h WSW
Pressure101.5 kPa
Solar Noon: 12:01 PM Humidity: 88%
Reported for Markham
Observed Nov 10, 12:00 a.m. ET
ECCC Stored Feed
IGTA Civic Environmental IntelligenceUpdated Nov 10, 12:00 a.m. ET
Your city. Your environment.
Meteorological indicators and the official Canadian Air Quality Health Index (AQHI) across the Greater Toronto Area.
No alerts at last check, 12:30 a.m. ET•UV forecast 1 Low, Tue, Nov 10.
AQHI 2 Low
Observation • Toronto City Centre Airport
ECCCReported for Markham
7°C
Mostly Cloudy
“Mainly cloudy. Wind northwest 30 km/h gusting to 50. High 15. UV index 1 or low.”
High / Low15° / 2°
Wind9 km/h WSW
Humidity88%
Barometer101.5 kPa
UV Index1 Low
Dew Point5°C
Observed Nov 10, 12:00 a.m. ET
AQHI • ECCC Canada
Toronto North2
Low Risk (1 – 3)Official Canadian Scale
Low (1-3)Moderate (4-6)High (7-10)Very High (10+)
Markham at Step 2
At-risk population: Enjoy your usual outdoor activities.
General population: Enjoy your usual outdoor activities.
PM2.53 µg/m³
Ozone (O₃)16 ppb
NO₂8.9 ppb
Observed Nov 9, 11:00 p.m. ET
Forecast Outlook
ECCCLocal Outlook
Forecast for Markham
Tuesday
Mainly cloudy. Wind northwest 30 km/h gusting to 50. High 15. UV index 1 or low. Tuesday night
Clearing in the evening. Wind west 30 km/h becoming light early in the evening. Low plus 2. Wednesday40% PoP
Cloudy with 40 percent chance of showers. High 10.Issued Nov 9, 3:30 p.m. ET
Meteorological Trajectory
24-Hour Markham Atmospheric Projection
The hourly forecast is temporarily unavailable.
Methodology
Understanding the Canadian AQHI Scale
The Air Quality Health Index is Canada's scale for the health risk of the air around you. Environment and Climate Change Canada publishes it, from a mixture of ground-level ozone, fine particulate matter (PM2.5) and nitrogen dioxide.
1 – 3 Low RiskEnjoy your usual outdoor activities.
4 – 6 Moderate RiskConsider reducing or rescheduling strenuous outdoor activities if you have symptoms like coughing or throat irritation.
7 – 10 High RiskReduce or reschedule strenuous outdoor activities.
10+ Very High RiskAvoid strenuous activities outdoors.
Cross-Regional Observatories
8 Active StationsGreater Toronto Station Array
2
Toronto
Metro Region
Low Risk
PM2.5: 5 µg/m³
1
Brampton
Peel Region
Low Risk
PM2.5: 3 µg/m³
2
Burlington
Halton Region
Low Risk
PM2.5: 3 µg/m³
2
Milton
Halton Region
Low Risk
PM2.5: 3 µg/m³
2
Mississauga
Peel Region
Low Risk
PM2.5: 3 µg/m³
1
Newmarket
York Region
Low Risk
PM2.5: 2 µg/m³
2
Oakville
Halton Region
Low Risk
PM2.5: 3 µg/m³
1
Oshawa
Durham Region
Low Risk
PM2.5: 2 µg/m³
Civic GIS Observation
GTA Environmental Overlay
Markham FocusRadar Nov 10, 12:15 a.m. ET
Places sit at their approximate centres. Lake Ontario's shore is simplified. Each pin links to that city.
Public Data Sources
Data Source: Environment and Climate Change Canada. Licence. Pollutant readings from Air Quality Ontario, automatically polled and not finally verified. IGTA is not affiliated with or endorsed by either government.
ECCC Canada
Ontario MECP
Notice: Shown as published and may be out of date. This is not a warning service. For official forecasts and alerts, see weather.gc.ca.
MarkhamYork Region
12:00 a.m. ET
Your city. Your environment.
Environment Canada weather and air quality for the Greater Toronto Area.
No alerts at last check, 12:30 a.m. ET • UV 1 forecast
Federal Air Quality
1.7AQHI Index 2 • Low Risk
1 Low (1-3)Moderate (4-6)High (7-10+)
General Population: Enjoy your usual outdoor activities.
At-Risk Community: Enjoy your usual outdoor activities.
PM 2.53 μg/m³
Ozone (O₃)16 ppb
NO₂8.9 ppb
Reported for Toronto North, the nearest Environment Canada location to Markham
Observed Nov 9, 11:00 p.m. ET
Hourly Trend
24-Hour Atmosphere Projection
The hourly forecast is temporarily unavailable.
Cross-Regional Readings
GTA Sensor Network Readings
Station: Toronto City Centre Airport
Markham
- Temperature
- 7°C, Mostly Cloudy
- Wind
- WSW 9 km/h
- Humidity
- 88%
- Pressure
- 101.5 kPa
- Air Quality Health Index
- 2, Low risk
Observed Nov 10, 12:00 a.m. ET · Reported for Markham
Station: King City North
Richmond Hill
- Temperature
- 5°C
- Wind
- SSW 9 km/h
- Humidity
- 99%
- Pressure
- 101.4 kPa
- Air Quality Health Index
- 2, Low risk
Observed Nov 10, 12:00 a.m. ET · Reported for Richmond Hill
Weather and forecastAir quality detailSwitch to Richmond Hill
Station: Toronto Pearson Int'l Airport
Toronto
- Temperature
- 7°C, Mostly Cloudy
- Wind
- SW 9 km/h
- Humidity
- 78%
- Pressure
- 101.5 kPa
- Air Quality Health Index
- 2, Low risk
Observed Nov 10, 12:00 a.m. ET · Reported for Toronto
Station: Toronto Pearson Int'l Airport
Mississauga
- Temperature
- 7°C, Mostly Cloudy
- Wind
- SW 9 km/h
- Humidity
- 78%
- Pressure
- 101.5 kPa
- Air Quality Health Index
- 2, Low risk
Observed Nov 10, 12:00 a.m. ET · Reported for Mississauga
Station: King City North
Vaughan
- Temperature
- 5°C
- Wind
- SSW 9 km/h
- Humidity
- 99%
- Pressure
- 101.4 kPa
- Air Quality Health Index
- 2, Low risk
Observed Nov 10, 12:00 a.m. ET · Reported for Vaughan
Outlook
Local Forecast
Tuesday
Mainly cloudy. Wind northwest 30 km/h gusting to 50. High 15. UV index 1 or low.
Tuesday night
Clearing in the evening. Wind west 30 km/h becoming light early in the evening. Low plus 2.
Wednesday40% PoP
Cloudy with 40 percent chance of showers. High 10.
Radar Mosaic
Retrieved Nov 10, 12:15 a.m. ET
Data Sources
Data Source: Environment and Climate Change Canada. Licence. Pollutants from Air Quality Ontario, not finally verified. Shown as published and may be out of date. This is not a warning service. For official forecasts and alerts, see weather.gc.ca. IGTA is not affiliated with or endorsed by either government.