Air Quality in Markham, Canada

Clear
27.6°C · 45.7% humidity
27.6°
Feels 29.1°
84
Moderate
Unusually sensitive people should consider reducing prolonged outdoor exertion.
2 stations

Nearby Monitoring Stations

AQI Forecast Calibrated
117 10am
117
117
84 1pm
93
100
105 4pm
108
111
133 7pm
114
106
106 10pm
107
109
116 1am
117
110
110 4am
110
108
108 7am
110
107
Station readings
119
126
114
CAMS model adj +83
34
34
34
34
34
34
34
34
34
54
34
25
25
25
27
34
34
27
27
27
25
25
27
24
AD 728×90

Air Quality Index Trend

38h · 1 stn

Markham's air quality is primarily affected by vehicle emissions and industrial activity. Seasonal wildfire smoke and weather patterns can cause periodic air quality deterioration. Current PM2.5 concentration in Markham is 1.8× the WHO 24-hour guideline of 15 µg/m³.

45.7%
Humidity
30.4 km/h
Wind ESE
1014.6 hPa
Pressure
12.9
UV Extreme
GoodModerateUSGUnhealthyVery UnhealthyHazardous

Which pollutant is driving the AQI?

PM2.5▲
84
27.71 µg/m³
PM10
78
109.3 µg/m³
050100150200300500

What is the weather forecast for Markham?

Temperature & Precipitation

PM2.5 Trend

38h · 1 station
PM2.527.71 µg/m³ ×1.8 WHO
Moderate
PM10109.3 µg/m³
Moderate
UV INDEX12.9
Extreme
AD 300×250
Station readings (2 stations within 25 km)
27.71
Median
29.11
Average
15.0
Low
43.23
High
PM2.5 µg/m³ · Model: 41.58 · Bias: +13.9

What is the 7-day forecast for Markham?

07-21
27.6° 21.0°
3.69 mm
07-22
23.2° 18.1°
0.94 mm
07-23
18.8° 14.7°
07-24
22.2° 16.7°
07-25
25.0° 13.9°
0.5 mm
07-26
26.8° 18.5°
0.5 mm
07-27
29.3° 19.4°
Both models agree Avg diff: 3.0°C

Where are air quality stations near Markham?

33
Toronto East, Ontario, Canada
13.2 km PM2.5: 7.9 µg/m³
39
Toronto East, Ontario, Canada
13.2 km PM2.5: 9.4 µg/m³
26
Toronto East, Ontario, Canada
13.2 km PM2.5: 6.2 µg/m³
30
Toronto North, Ontario, Canada
15.4 km PM2.5: 7.2 µg/m³
18
Toronto North, Ontario, Canada
15.4 km PM2.5: 4.3 µg/m³
57
NASA GSFC Rutgers Calib. N20
18.4 km PM2.5: 15.0 µg/m³
114
Wood Glen
20.4 km PM2.5: 40.8 µg/m³ PM10: 54.7 µg/m³
50
Toronto Downtown, Ontario, Canada
24.7 km PM2.5: 12.0 µg/m³
32
Toronto
25.5 km PM2.5: 7.7 µg/m³
38
Toronto
25.5 km PM2.5: 9.1 µg/m³

What cities are near Markham?

84 Milliken 92 Agincourt North 96 Malvern 79 Steeles 96 Agincourt South-Malvern West 86 L'Amoreaux 74 Hillcrest Village 95 Tam O'Shanter-Sullivan 101 Morningside 83 Pleasant View
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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.