Air quality
Air quality in Kwai Chung today
Updated
Moderate (US AQI 88) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Oct 26, 10:00 am (02:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Kwai Chung, Kwai Tsing District, Hong Kong, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 88 Moderate
- PM2.5
- 29 µg/m³ 1.9× WHO 24-h guideline
- PM10
- 30 µg/m³
- Ozone
- 73 µg/m³
- Dominant pollutant
- PM2.5 sub-index 88
- Best hour today
- 10:00 am AQI 88
- European AQI
- 48
Air quality in Kwai Chung right now
Right now the modelled US Air Quality Index for Kwai Chung, Kwai Tsing District, Hong Kong is 88, 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 88. 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 29 µg/m³, 1.9 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 30 µg/m³ against a guideline of 45; ozone is 73 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 28 µg/m³ (above the 24-hour guideline of 25).
Also this hour: UV index 5.3, carbon monoxide 284 µg/m³.
Kwai Chung AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 88 around Mon 10:00 am to 94 around Tue 7:00 am, staying "Moderate" throughout.
The following day looks similar, averaging about 95.
| Local time (Asia/Hong_Kong) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 10:00 am | 88 | Moderate | 29.2 | 30 | 73 |
| Mon 1:00 pm | 89 | Moderate | 25.5 | 26 | 122 |
| Mon 4:00 pm | 90 | Moderate | 27.1 | 28 | 121 |
| Mon 7:00 pm | 92 | Moderate | 35.9 | 37 | 63 |
| Mon 10:00 pm | 92 | Moderate | 36 | 40 | 44 |
| Tue 1:00 am | 92 | Moderate | 36 | 41 | 57 |
| Tue 4:00 am | 93 | Moderate | 33.8 | 38 | 49 |
| Tue 7:00 am | 94 | Moderate | 38.8 | 41 | 35 |
| Tue 10:00 am | 93 | Moderate | 26.7 | 28 | 91 |
| Tue 1:00 pm | 93 | Moderate | 25.7 | 27 | 140 |
| Tue 4:00 pm | 93 | Moderate | 29.6 | 31 | 127 |
| Tue 7:00 pm | 94 | Moderate | 39 | 41 | 82 |
| Tue 10:00 pm | 96 | Moderate | 46 | 53 | 85 |
| Wed 1:00 am | 98 | Moderate | 38.2 | 46 | 113 |
| Wed 4:00 am | 97 | Moderate | 24 | 29 | 104 |
| Wed 7:00 am | 95 | Moderate | 27 | 28 | 78 |
| Wed 10:00 am | 93 | Moderate | 28.6 | 30 | 104 |
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 Kwai Chung today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 10:00 am (AQI 88, Moderate) and the worst around 7:00 pm (AQI 92). The difference across the day is small, so timing matters little.
Kwai Chung vs the rest of Hong Kong
Across 23 Hong Kong cities we track, the average US AQI right now is 84 (Moderate). Kwai Chung at 88 is about average.
It ranks 9 of 23 from cleanest to most polluted; the cleanest is Hong Kong (84) and the most polluted Jordan (84).
For context, the median across 3,909 cities worldwide is 57.
Air quality in cities near Kwai Chung
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Tsuen Wan | 3 km | 84 | Moderate | 17 |
| Tsing Yi Town | 4 km | 84 | Moderate | 17 |
| Sham Shui Po | 5 km | 84 | Moderate | 17 |
| Sha Tin | 5 km | 84 | Moderate | 17 |
| Wong Tai Sin | 5 km | 84 | Moderate | 17 |
| Kowloon City | 7 km | 84 | Moderate | 17 |
| Jordan | 8 km | 84 | Moderate | 17 |
| Victoria | 9 km | 84 | Moderate | 17 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Kwai Chung, 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 39 µg/m³ in the next 24 hours while NASA satellites detected 33 fire hotspots within 300 km in the last day (nearest about 19 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 88, 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 Kwai Chung
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.