Air quality
Air quality in Walthamstow today
Updated
Good (US AQI 27) Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. Model estimate for Mon, Oct 26, 2:00 am (02:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Walthamstow, England, United Kingdom, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 27 Good
- PM2.5
- 4.6 µg/m³ 0.3× WHO 24-h guideline
- PM10
- 17 µg/m³
- Ozone
- 59 µg/m³
- Dominant pollutant
- ozone sub-index 27
- Best hour today
- 9:00 am AQI 24
- European AQI
- 21
Air quality in Walthamstow right now
Right now the modelled US Air Quality Index for Walthamstow, England, United Kingdom is 27, which falls in the "Good" band (up to 50). Air quality is satisfactory and poses little or no risk; a good time for outdoor activity.
The index is driven mainly by ozone, whose own sub-index is 27. Ozone usually peaks in the afternoon on sunny days and falls back after sunset.
PM2.5 is 4.6 µg/m³, within the WHO 24-hour guideline of 15 µg/m³; PM10 is 17 µg/m³ against a guideline of 45; ozone is 59 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 9.7 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 153 µg/m³.
NASA FIRMS shows 28 fire hotspots within 300 km in the last day (nearest about 126 km), but particle levels are not elevated enough to point to smoke right now.
Walthamstow AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 24 around Mon 9:00 am to 27 around Mon 2:00 am, staying "Good" throughout.
The following day looks similar, averaging about 25.
| Local time (Europe/London) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 2:00 am | 27 | Good | 4.6 | 17 | 59 |
| Mon 5:00 am | 26 | Good | 4.5 | 17 | 56 |
| Mon 8:00 am | 25 | Good | 6.1 | 17 | 40 |
| Mon 11:00 am | 24 | Good | 3.4 | 7 | 59 |
| Mon 2:00 pm | 25 | Good | 3.4 | 6 | 53 |
| Mon 5:00 pm | 26 | Good | 6.4 | 12 | 45 |
| Mon 8:00 pm | 27 | Good | 5.1 | 9 | 46 |
| Mon 11:00 pm | 27 | Good | 4.1 | 8 | 53 |
| Tue 2:00 am | 26 | Good | 3.2 | 7 | 51 |
| Tue 5:00 am | 25 | Good | 3.2 | 6 | 56 |
| Tue 8:00 am | 25 | Good | 2.6 | 6 | 53 |
| Tue 11:00 am | 25 | Good | 4.1 | 9 | 58 |
| Tue 2:00 pm | 26 | Good | 3.6 | 8 | 61 |
| Tue 5:00 pm | 27 | Good | 4 | 9 | 54 |
| Tue 8:00 pm | 26 | Good | 5.1 | 13 | 48 |
| Tue 11:00 pm | 24 | Good | 6.4 | 12 | 49 |
| Wed 2:00 am | 23 | Good | 5.7 | 12 | 53 |
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 Walthamstow today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 9:00 am (AQI 24, Good) and the worst around 6:00 am (AQI 27). The difference across the day is small, so timing matters little.
Walthamstow vs the rest of United Kingdom
Across 117 United Kingdom cities we track, the average US AQI right now is 32 (Good). Walthamstow at 27 is 5 points cleaner than average.
It ranks 9 of 117 from cleanest to most polluted; the cleanest is London (27) and the most polluted Newquay (37).
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Walthamstow
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Tottenham | 4 km | 27 | Good | 4.5 |
| Edmonton, England | 5 km | 28 | Good | 4.5 |
| Ilford | 7 km | 27 | Good | 4.5 |
| Enfield Town | 8 km | 28 | Good | 4.5 |
| Islington | 8 km | 27 | Good | 4.5 |
| Barking | 10 km | 27 | Good | 4.5 |
| London | 12 km | 27 | Good | 4.5 |
| City of Westminster | 13 km | 27 | Good | 4.5 |
Model vs measured
The nearest measured PM2.5 reading is 2.5 µg/m³ from Sensor.Community (median of 25 sensors), centred about 24 km from the city centre. That is close to the model estimate of 4.6 µg/m³. Low-cost sensors can read high in humid air; reference monitors are more accurate but sparser.
Advice for sensitive groups
With the AQI at 27, there is no need for sensitive groups to change plans. People with asthma should still carry their reliever inhaler as usual.
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 Walthamstow
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), Sensor.Community, NASA FIRMS.