Air quality
Air quality in Brentwood Bay today
Updated
Moderate (US AQI 73) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Nov 2, 8:00 pm (03:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Brentwood Bay, British Columbia, Canada, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 73 Moderate
- PM2.5
- 38 µg/m³ 2.6× WHO 24-h guideline
- PM10
- 39 µg/m³
- Ozone
- 10 µg/m³
- Dominant pollutant
- PM2.5 sub-index 73
- Best hour tomorrow
- 6:00 am AQI 85
- European AQI
- 53
Air quality in Brentwood Bay right now
Right now the modelled US Air Quality Index for Brentwood Bay, British Columbia, Canada is 73, which falls in the "Moderate" band (up to 100). Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors.
The index is driven mainly by PM2.5, whose own sub-index is 73. Fine and coarse particles come from traffic, heating, industry, dust and smoke; they build up on calm nights and clear when wind or rain arrives.
PM2.5 is 38 µg/m³, 2.6 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 39 µg/m³ against a guideline of 45; ozone is 10 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 44 µg/m³ (above the 24-hour guideline of 25).
Also this hour: carbon monoxide 518 µg/m³.
Brentwood Bay AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 73 around Mon 8:00 pm to 103 around Tue 7:00 pm, from "Moderate" at best to "Unhealthy for Sensitive Groups" at worst.
The following day is expected to be worse, averaging about 98 against 88 for the next 24 hours.
| Local time (America/Vancouver) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 8:00 pm | 73 | Moderate | 38.3 | 39 | 10 |
| Mon 11:00 pm | 77 | Moderate | 41.9 | 43 | 9 |
| Tue 2:00 am | 81 | Moderate | 38.9 | 39 | 15 |
| Tue 5:00 am | 84 | Moderate | 38.8 | 40 | 15 |
| Tue 8:00 am | 88 | Moderate | 38 | 40 | 14 |
| Tue 11:00 am | 93 | Moderate | 32.1 | 34 | 31 |
| Tue 2:00 pm | 97 | Moderate | 30.9 | 33 | 40 |
| Tue 5:00 pm | 100 | Moderate | 35 | 37 | 30 |
| Tue 8:00 pm | 103 | Unhealthy for Sensitive Groups | 33.2 | 36 | 20 |
| Tue 11:00 pm | 101 | Unhealthy for Sensitive Groups | 36.2 | 38 | 36 |
| Wed 2:00 am | 100 | Moderate | 38.4 | 40 | 39 |
| Wed 5:00 am | 99 | Moderate | 31.5 | 33 | 40 |
| Wed 8:00 am | 97 | Moderate | 27.5 | 29 | 51 |
| Wed 11:00 am | 95 | Moderate | 30.3 | 32 | 45 |
| Wed 2:00 pm | 95 | Moderate | 30.2 | 32 | 39 |
| Wed 5:00 pm | 95 | Moderate | 35.4 | 38 | 23 |
| Wed 8:00 pm | 95 | Moderate | 41 | 43 | 9 |
Every third hour of the CAMS forecast via Open-Meteo. US AQI uses rolling averages (24 h for particles, 8 h for ozone), so it moves more slowly than the hourly concentrations.
Best time to be outside in Brentwood Bay tomorrow
Between 6 am and 9 pm local time, the cleanest air tomorrow is forecast around 6:00 am (AQI 85, Moderate) and the worst around 7:00 pm (AQI 103). That is a swing of 18 points, so a run or walk around 6:00 am is noticeably better.
Brentwood Bay vs the rest of Canada
Across 79 Canada cities we track, the average US AQI right now is 45 (Good). Brentwood Bay at 73 is 28 points worse than average.
For context, the median across 4,024 cities worldwide is 57.
Air quality in cities near Brentwood Bay
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Central Saanich | 3 km | 73 | Moderate | 38.3 |
| Saanich | 7 km | 55 | Moderate | 21.6 |
| Sidney | 8 km | 101 | Unhealthy for Sensitive Groups | 97.3 |
| North Saanich | 10 km | 101 | Unhealthy for Sensitive Groups | 97.3 |
| Mill Bay | 10 km | 101 | Unhealthy for Sensitive Groups | 97.3 |
| View Royal | 14 km | 73 | Moderate | 38.3 |
| Tillicum | 15 km | 73 | Moderate | 38.3 |
| Esquimalt | 17 km | 73 | Moderate | 38.3 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Brentwood Bay, so the numbers on this page are model estimates. Models capture regional pollution well but can miss very local sources such as a busy road or a nearby fire.
Wildfire smoke
PM2.5 is forecast to reach 42 µg/m³ in the next 24 hours while NASA satellites detected 23 fire hotspots within 300 km in the last day (nearest about 66 km away). Smoke is a likely contributor: keep windows closed, run an air purifier or HVAC filter, and check the fire map before heading out.
Advice for sensitive groups
At 73, most people are fine outdoors. If you are unusually sensitive to PM2.5, keep long or intense workouts to the cleaner hours shown above.
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Values on this page are modelled by CAMS (Copernicus) and served by Open-Meteo; they are estimates for the area around the city centre, not readings from an official monitor.
Nearby cities
More for Brentwood Bay
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.