Air quality in Markham
The US Air Quality Index (EPA) grades air from 0 to 500 using fine particles (PM2.5/PM10), ozone and nitrogen dioxide. 0-50 is Good, 51-100 Moderate, 101-150 Unhealthy for Sensitive Groups, and anything higher affects everyone.
PM2.5
7 µg/m³
WHO guideline 15
PM10
7.2 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
3:00 AM
💨
PM2.5 7 µg/m³
29Good
4:00 AM
💨
PM2.5 7.3 µg/m³
30Good
5:00 AM
💨
PM2.5 7.3 µg/m³
30Good
6:00 AM
💨
PM2.5 7.3 µg/m³
30Good
7:00 AM
💨
PM2.5 7.7 µg/m³
32Good
8:00 AM
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PM2.5 8 µg/m³
33Good
9:00 AM
💨
PM2.5 4 µg/m³
22Good
10:00 AM
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PM2.5 3.4 µg/m³
31Good
11:00 AM
💨
PM2.5 3.3 µg/m³
38Good
12:00 PM
💨
PM2.5 3.3 µg/m³
42Good
1:00 PM
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PM2.5 3.3 µg/m³
43Good
2:00 PM
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PM2.5 3.4 µg/m³
43Good
Next few days
daily max · US EPA AQI
Tue
💨
No data · UV High
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