Air quality in Ontario
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
5 µg/m³
WHO guideline 15
PM10
5.8 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
5:00 PM
💨
PM2.5 5 µg/m³
48 Good
6:00 PM
💨
PM2.5 5.3 µg/m³
43 Good
7:00 PM
💨
PM2.5 6.3 µg/m³
35 Good
8:00 PM
💨
PM2.5 7.7 µg/m³
32 Good
9:00 PM
💨
PM2.5 9.1 µg/m³
38 Good
10:00 PM
💨
PM2.5 8.7 µg/m³
36 Good
11:00 PM
💨
PM2.5 7.8 µg/m³
33 Good
12:00 AM
💨
PM2.5 6.8 µg/m³
28 Good
1:00 AM
💨
PM2.5 6 µg/m³
30 Good
2:00 AM
💨
PM2.5 5.7 µg/m³
32 Good
3:00 AM
💨
PM2.5 5.6 µg/m³
32 Good
4:00 AM
💨
PM2.5 5.7 µg/m³
31 Good
Next few days daily max · US EPA AQI
Fri
💨
Good · UV Moderate
49
Sat
💨
Good · UV Moderate
46
Mon
💨
Good · UV Moderate
44
Tue
💨
Good · UV Moderate
43
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Precip NEXRAD · NOAA Temp Wind Clouds Terrain