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
4.6 µg/m³
WHO guideline 15
PM10
5.3 µg/m³
WHO guideline 45
Hour by hour (12h) US EPA AQI
3:00 PM
💨
PM2.5 4.6 µg/m³
51 Moderate
4:00 PM
💨
PM2.5 5 µg/m³
55 Moderate
5:00 PM
💨
PM2.5 6 µg/m³
49 Good
6:00 PM
💨
PM2.5 7.9 µg/m³
37 Good
7:00 PM
💨
PM2.5 10.9 µg/m³
45 Good
8:00 PM
💨
PM2.5 13.3 µg/m³
54 Moderate
9:00 PM
💨
PM2.5 15.3 µg/m³
58 Moderate
10:00 PM
💨
PM2.5 17.5 µg/m³
62 Moderate
11:00 PM
💨
PM2.5 17.7 µg/m³
63 Moderate
12:00 AM
💨
PM2.5 15.9 µg/m³
59 Moderate
1:00 AM
💨
PM2.5 13.7 µg/m³
54 Moderate
2:00 AM
💨
PM2.5 11.4 µg/m³
48 Good
Next few days daily max · US EPA AQI
Wed
💨
Moderate · UV High
63
Thu
💨
Moderate · UV High
59
Sun
💨
Moderate · UV Very high
52
JavaScript is needed for the map — the city links below work without it.
Precip NEXRAD · NOAA Temp Wind Clouds Terrain