AQHI now · Thornhill
All cities →3.5
Moderate health risk
Observed Mon 9:00 PM · Toronto North
- Tonight
- 4 Moderate risk
- Tomorrow
- 3 Low risk
- Tomorrow night
- 3 Low risk
Environment and Climate Change Canada · forecast issued Mon 5:00 PM
Health advice now
- People at risk
- Consider reducing or rescheduling strenuous activities outdoors if you are experiencing symptoms.
- Everyone else
- No need to modify your usual outdoor activities unless you experience symptoms such as coughing and throat irritation.
Pollutants now
PM2.59.7 µg/m³WHO guideline 15
PM109.8 µg/m³WHO guideline 45
NO₂43 µg/m³WHO guideline 25
O₃33 µg/m³WHO guideline 100
Model estimates from WeatherAPI.com; WHO 24-hour guidelines (8-hour for ozone).
Pollen today · Thornhill
TreesNonenone in the air
GrassLow<1 grains/m³
WeedsLow<1 grains/m³ · Ragweed
Tue: weeds low · Wed: weeds low · Thu: 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 |
|---|---|---|
| 10 PM | 9.7 | 9.8 |
| 11 PM | 8.5 | 8.6 |
| 12 AM | 7.2 | 7.3 |
| 1 AM | 6.2 | 6.5 |
| 2 AM | 6.1 | 6.8 |
| 3 AM | 6.1 | 7.2 |
| 4 AM | 5.8 | 6.8 |
| 5 AM | 5.7 | 6.7 |
| 6 AM | 6 | 7 |
| 7 AM | 7.1 | 8.2 |
| 8 AM | 8.9 | 10 |
| 9 AM | 9.1 | 10.1 |