AQHI now · Thorold
All cities →1.3
Low health risk
Observed Thu 12:00 PM · St. Catharines
- Today
- 2 Low risk
- Tonight
- 2 Low risk
- Tomorrow
- 2 Low risk
- Tomorrow night
- 2 Low risk
Environment and Climate Change Canada · forecast issued Thu 6:00 AM
Health advice now
- People at risk
- Enjoy your usual outdoor activities.
- Everyone else
- Ideal air quality for outdoor activities.
Pollutants now
PM2.54.1 µg/m³WHO guideline 15
PM104.1 µg/m³WHO guideline 45
NO₂5 µg/m³WHO guideline 25
O₃61 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
Fri: weeds low · Sat: weeds low · Sun: 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 |
|---|---|---|
| 12 PM | 4.1 | 4.1 |
| 1 PM | 3.9 | 3.9 |
| 2 PM | 4.2 | 4.2 |
| 3 PM | 4.6 | 4.7 |
| 4 PM | 5.1 | 5.2 |
| 5 PM | 5.6 | 5.7 |
| 6 PM | 6 | 6.1 |
| 7 PM | 6.4 | 6.5 |
| 8 PM | 6.8 | 7 |
| 9 PM | 7.2 | 7.3 |
| 10 PM | 7.4 | 7.6 |
| 11 PM | 8.1 | 8.4 |