Air quality
Air quality in Hangzhou today
Updated
Unhealthy for Sensitive Groups (US AQI 101) People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. Model estimate for Mon, Oct 26, 10:00 am (02:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Hangzhou, Zhejiang, China, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 101 Unhealthy for Sensitive Groups
- PM2.5
- 37 µg/m³ 2.5× WHO 24-h guideline
- PM10
- 45 µg/m³
- Ozone
- 68 µg/m³
- Dominant pollutant
- PM2.5 sub-index 101
- Best hour today
- 10:00 am AQI 101
- European AQI
- 52
Air quality in Hangzhou right now
Right now the modelled US Air Quality Index for Hangzhou, Zhejiang, China is 101, which falls in the "Unhealthy for Sensitive Groups" band (up to 150). People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors.
The index is driven mainly by PM2.5, whose own sub-index is 101. 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 37 µg/m³, 2.5 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 45 µg/m³ against a guideline of 45; ozone is 68 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 23 µg/m³ (below the 24-hour guideline of 25).
Also this hour: UV index 5, carbon monoxide 436 µg/m³.
Hangzhou AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 101 around Mon 10:00 am to 159 around Tue 8:00 am, from "Unhealthy for Sensitive Groups" at best to "Unhealthy" at worst.
The following day is expected to be worse, averaging about 143 against 132 for the next 24 hours.
| Local time (Asia/Shanghai) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 10:00 am | 101 | Unhealthy for Sensitive Groups | 36.8 | 45 | 68 |
| Mon 1:00 pm | 108 | Unhealthy for Sensitive Groups | 28 | 34 | 133 |
| Mon 4:00 pm | 112 | Unhealthy for Sensitive Groups | 27.8 | 32 | 102 |
| Mon 7:00 pm | 117 | Unhealthy for Sensitive Groups | 80.8 | 86 | 22 |
| Mon 10:00 pm | 132 | Unhealthy for Sensitive Groups | 117.1 | 123 | 0 |
| Tue 1:00 am | 151 | Unhealthy | 95.2 | 98 | 0 |
| Tue 4:00 am | 155 | Unhealthy | 76.4 | 78 | 0 |
| Tue 7:00 am | 158 | Unhealthy | 92 | 93 | 6 |
| Tue 10:00 am | 159 | Unhealthy | 33.6 | 40 | 24 |
| Tue 1:00 pm | 159 | Unhealthy | 26.4 | 33 | 36 |
| Tue 4:00 pm | 159 | Unhealthy | 25.6 | 33 | 23 |
| Tue 7:00 pm | 158 | Unhealthy | 43.4 | 49 | 5 |
| Tue 10:00 pm | 154 | Unhealthy | 47 | 54 | 1 |
| Wed 1:00 am | 140 | Unhealthy for Sensitive Groups | 35.6 | 47 | 6 |
| Wed 4:00 am | 124 | Unhealthy for Sensitive Groups | 31.3 | 45 | 3 |
| Wed 7:00 am | 110 | Unhealthy for Sensitive Groups | 54.1 | 68 | 9 |
| Wed 10:00 am | 102 | Unhealthy for Sensitive Groups | 27.6 | 42 | 51 |
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 Hangzhou today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 10:00 am (AQI 101, Unhealthy for Sensitive Groups) and the worst around 9:00 pm (AQI 126). That is a swing of 25 points, so a run or walk around 10:00 am is noticeably better.
Hangzhou vs the rest of China
Across 447 China cities we track, the average US AQI right now is 86 (Moderate). Hangzhou at 101 is 15 points worse than average.
It ranks 308 of 447 from cleanest to most polluted; the cleanest is Hulunbuir (19) and the most polluted Kashgar (223).
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Hangzhou
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Shaoxing | 52 km | 93 | Moderate | 42.7 |
| Huzhou | 64 km | 81 | Moderate | 43.8 |
| Shangyu | 75 km | 87 | Moderate | 41.2 |
| Jiaxing | 76 km | 88 | Moderate | 45.4 |
| Puyang | 97 km | 88 | Moderate | 32.2 |
| Cixi | 105 km | 82 | Moderate | 39.8 |
| Yiwu | 109 km | 93 | Moderate | 35.5 |
| Zhujing | 117 km | 96 | Moderate | 46.3 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Hangzhou, 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 117 µg/m³ in the next 24 hours while NASA satellites detected 88 fire hotspots within 300 km in the last day (nearest about 49 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 101, children, older adults, pregnant people and anyone with asthma, COPD or heart disease should limit time outdoors, especially strenuous activity. A well-fitted N95/FFP2 mask cuts particle exposure; it does not filter ozone.
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 Hangzhou
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.