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
13.9 µg/m³
WHO guideline 15
PM10
14.2 µg/m³
WHO guideline 45
Hour by hour (12h)
US EPA AQI
1:00 PM
💨
PM2.5 13.9 µg/m³
95Moderate
2:00 PM
💨
PM2.5 13.6 µg/m³
99Moderate
3:00 PM
💨
PM2.5 12.8 µg/m³
98Moderate
4:00 PM
💨
PM2.5 11.8 µg/m³
86Moderate
5:00 PM
💨
PM2.5 10.6 µg/m³
65Moderate
6:00 PM
💨
PM2.5 10 µg/m³
46Good
7:00 PM
💨
PM2.5 10.7 µg/m³
45Good
8:00 PM
💨
PM2.5 10.8 µg/m³
45Good
9:00 PM
💨
PM2.5 12 µg/m³
50Good
10:00 PM
💨
PM2.5 12.5 µg/m³
52Moderate
11:00 PM
💨
PM2.5 11.3 µg/m³
47Good
12:00 AM
💨
PM2.5 10.9 µg/m³
45Good
Next few days
daily max · US EPA AQI
Fri
💨
Moderate · UV High
99
Sat
💨
Moderate · UV High
65
Sun
💨
Moderate · UV High
52
Mon
💨
Moderate · UV Very high
61
Tue
💨
Moderate · UV High
53