AQHI now · St. Catharines
All cities →2
Low health risk
Observed Thu 5:00 PM · St. Catharines
- Tonight
- 3 Low risk
- Tomorrow
- 2 Low risk
- Tomorrow night
- 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
PM2.59.4 µg/m³WHO guideline 15
PM109.6 µg/m³WHO guideline 45
NO₂24 µg/m³WHO guideline 25
O₃69 µg/m³WHO guideline 100
Model estimates from WeatherAPI.com; WHO 24-hour guidelines (8-hour for ozone).
Pollen today · St. Catharines
TreesNonenone in the air
GrassModerate6 grains/m³
WeedsHigh130 grains/m³ · Ragweed
Fri: weeds high · Sat: weeds moderate · Sun: weeds moderate
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 |
|---|---|---|
| 6 PM | 9.4 | 9.6 |
| 7 PM | 11.6 | 11.7 |
| 8 PM | 13.7 | 13.9 |
| 9 PM | 14.9 | 15 |
| 10 PM | 14.5 | 14.6 |
| 11 PM | 13 | 13.1 |
| 12 AM | 10.2 | 10.3 |
| 1 AM | 6.6 | 6.7 |
| 2 AM | 4.3 | 4.4 |
| 3 AM | 3.3 | 3.4 |
| 4 AM | 2.8 | 2.9 |
| 5 AM | 2.8 | 2.9 |