AQHI now · College Heights
All cities →1.5
Low health risk
Observed Fri 5:00 AM · Thunder Bay
- Today
- 2 Low risk
- Tonight
- 2 Low risk
Environment and Climate Change Canada · forecast issued Thu 5:00 PM
Health advice now
- People at risk
- Enjoy your usual outdoor activities.
- Everyone else
- Ideal air quality for outdoor activities.
Pollutants now
PM2.50.3 µg/m³WHO guideline 15
PM100.4 µg/m³WHO guideline 45
NO₂1 µg/m³WHO guideline 25
O₃69 µg/m³WHO guideline 100
Model estimates from WeatherAPI.com; WHO 24-hour guidelines (8-hour for ozone).
Particles · next 12 hours
µg/m³| Time | PM2.5 | PM10 |
|---|---|---|
| 6 AM | 0.3 | 0.4 |
| 7 AM | 0.4 | 0.5 |
| 8 AM | 0.6 | 0.7 |
| 9 AM | 0.5 | 0.7 |
| 10 AM | 0.5 | 0.6 |
| 11 AM | 0.5 | 0.7 |
| 12 PM | 0.6 | 0.7 |
| 1 PM | 0.6 | 0.9 |
| 2 PM | 0.7 | 1 |
| 3 PM | 0.8 | 1.1 |
| 4 PM | 0.9 | 1.1 |
| 5 PM | 1.2 | 1.4 |