AQHI now · Thorold
All cities →1.1
Low health risk
Observed Fri 3:00 PM · St. Catharines
- Today
- 2 Low risk
- Tonight
- 2 Low risk
- Tomorrow
- 2 Low risk
- Tomorrow night
- 1 Low risk
Environment and Climate Change Canada · forecast issued Fri 6:00 AM
Health advice now
- People at risk
- Enjoy your usual outdoor activities.
- Everyone else
- Ideal air quality for outdoor activities.
Pollutants now
PM2.51.8 µg/m³WHO guideline 15
PM101.8 µg/m³WHO guideline 45
NO₂11 µg/m³WHO guideline 25
O₃50 µg/m³WHO guideline 100
Model estimates from WeatherAPI.com; WHO 24-hour guidelines (8-hour for ozone).
Pollen today · Thorold
TreesNonenone in the air
GrassNonenone in the air
WeedsLow<1 grains/m³ · Ragweed
Sat: weeds low · Sun: weeds low · Mon: weeds low
Model estimate from WeatherAPI.com — pollen grains per m³ of air; levels on the National Allergy Bureau scale.
Model estimate from WeatherAPI.com — pollen grains per m³ of air; levels on the National Allergy Bureau scale.
Particles · next 12 hours
µg/m³| Time | PM2.5 | PM10 |
|---|---|---|
| 4 PM | 1.8 | 1.8 |
| 5 PM | 1.9 | 1.9 |
| 6 PM | 2.4 | 2.4 |
| 7 PM | 2.7 | 2.8 |
| 8 PM | 2.6 | 2.7 |
| 9 PM | 2.4 | 2.5 |
| 10 PM | 2.3 | 2.3 |
| 11 PM | 2.1 | 2.1 |
| 12 AM | 1.9 | 1.9 |
| 1 AM | 1.7 | 1.8 |
| 2 AM | 1.5 | 1.6 |
| 3 AM | 1.4 | 1.5 |