Air quality
Air quality in Haikou today
Updated
Unhealthy for Sensitive Groups (US AQI 102) 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, 2:00 am (18:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Haikou, Hainan, China, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 102 Unhealthy for Sensitive Groups
- PM2.5
- 20 µg/m³ 1.3× WHO 24-h guideline
- PM10
- 25 µg/m³
- Ozone
- 106 µg/m³
- Dominant pollutant
- ozone sub-index 102
- Best hour today
- 9:00 pm AQI 62
- European AQI
- 46
Air quality in Haikou right now
Right now the modelled US Air Quality Index for Haikou, Hainan, China is 102, 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 ozone, whose own sub-index is 102. Ozone usually peaks in the afternoon on sunny days and falls back after sunset.
PM2.5 is 20 µg/m³, 1.3 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 25 µg/m³ against a guideline of 45; ozone is 106 µg/m³ (above the WHO 8-hour level of 100); nitrogen dioxide is 5.4 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 321 µg/m³.
NASA FIRMS shows 102 fire hotspots within 300 km in the last day (nearest about 49 km), but particle levels are not elevated enough to point to smoke right now.
Haikou AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 58 around Tue 2:00 am to 102 around Mon 2:00 am, from "Moderate" at best to "Unhealthy for Sensitive Groups" at worst.
The following day is expected to be worse, averaging about 94 against 70 for the next 24 hours.
| Local time (Asia/Shanghai) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 2:00 am | 102 | Unhealthy for Sensitive Groups | 20 | 25 | 106 |
| Mon 5:00 am | 70 | Moderate | 20.4 | 26 | 95 |
| Mon 8:00 am | 69 | Moderate | 16.5 | 21 | 115 |
| Mon 11:00 am | 67 | Moderate | 10.1 | 13 | 119 |
| Mon 2:00 pm | 66 | Moderate | 11.7 | 15 | 125 |
| Mon 5:00 pm | 72 | Moderate | 8.6 | 11 | 116 |
| Mon 8:00 pm | 67 | Moderate | 10.4 | 14 | 99 |
| Mon 11:00 pm | 60 | Moderate | 12.4 | 17 | 104 |
| Tue 2:00 am | 58 | Moderate | 13.6 | 19 | 110 |
| Tue 5:00 am | 57 | Moderate | 15.5 | 21 | 107 |
| Tue 8:00 am | 56 | Moderate | 18.2 | 23 | 115 |
| Tue 11:00 am | 60 | Moderate | 19.7 | 26 | 139 |
| Tue 2:00 pm | 86 | Moderate | 25.7 | 33 | 164 |
| Tue 5:00 pm | 120 | Unhealthy for Sensitive Groups | 26.9 | 35 | 164 |
| Tue 8:00 pm | 142 | Unhealthy for Sensitive Groups | 27.6 | 35 | 165 |
| Tue 11:00 pm | 144 | Unhealthy for Sensitive Groups | 24.5 | 32 | 148 |
| Wed 2:00 am | 130 | Unhealthy for Sensitive Groups | 24.7 | 34 | 135 |
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 Haikou today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 9:00 pm (AQI 62, Moderate) and the worst around 5:00 pm (AQI 72). That is a swing of 10 points, so a run or walk around 9:00 pm is noticeably better.
Haikou vs the rest of China
Across 467 China cities we track, the average US AQI right now is 84 (Moderate). Haikou at 102 is 18 points worse than average.
It ranks 353 of 467 from cleanest to most polluted; the cleanest is Hulunbuir (21) and the most polluted Artux (264).
For context, the median across 3,909 cities worldwide is 57.
Air quality in cities near Haikou
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Xiuying | 7 km | 102 | Unhealthy for Sensitive Groups | 20 |
| Wenchang | 72 km | 119 | Unhealthy for Sensitive Groups | 19.9 |
| Qionghai | 89 km | 95 | Moderate | 21.4 |
| Zhanjiang | 133 km | 123 | Unhealthy for Sensitive Groups | 24.2 |
| Wanning | 137 km | 136 | Unhealthy for Sensitive Groups | 20.7 |
| Wuchuan | 164 km | 101 | Unhealthy for Sensitive Groups | 33.6 |
| Lianjiang | 179 km | 103 | Unhealthy for Sensitive Groups | 31.2 |
| Maoming | 191 km | 101 | Unhealthy for Sensitive Groups | 33.6 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Haikou, 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.
Advice for sensitive groups
At 102, 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 Haikou
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.