Air quality
Air quality in Yima today
Updated
Unhealthy (US AQI 154) Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. Model estimate for Mon, Oct 26, 9:00 am (01:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Yima, Henan, China, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 154 Unhealthy
- PM2.5
- 33 µg/m³ 2.2× WHO 24-h guideline
- PM10
- 34 µg/m³
- Ozone
- 11 µg/m³
- Dominant pollutant
- PM2.5 sub-index 154
- Best hour today
- 9:00 pm AQI 117
- European AQI
- 50
Air quality in Yima right now
Right now the modelled US Air Quality Index for Yima, Henan, China is 154, which falls in the "Unhealthy" band (up to 200). Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed.
The index is driven mainly by PM2.5, whose own sub-index is 154. 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 33 µg/m³, 2.2 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 34 µg/m³ against a guideline of 45; ozone is 11 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 25 µg/m³ (right at the 24-hour guideline of 25).
Also this hour: UV index 0.9, carbon monoxide 713 µg/m³.
Yima AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 58 around Tue 9:00 am to 154 around Mon 9:00 am, from "Moderate" at best to "Unhealthy" at worst.
The following day is expected to be cleaner, averaging about 62 against 114 for the next 24 hours.
| Local time (Asia/Shanghai) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 9:00 am | 154 | Unhealthy | 32.5 | 34 | 11 |
| Mon 12:00 pm | 152 | Unhealthy | 8.9 | 9 | 44 |
| Mon 3:00 pm | 144 | Unhealthy for Sensitive Groups | 9.8 | 18 | 65 |
| Mon 6:00 pm | 132 | Unhealthy for Sensitive Groups | 14.8 | 33 | 66 |
| Mon 9:00 pm | 117 | Unhealthy for Sensitive Groups | 15.4 | 33 | 63 |
| Tue 12:00 am | 97 | Moderate | 13.3 | 25 | 58 |
| Tue 3:00 am | 82 | Moderate | 11.8 | 22 | 55 |
| Tue 6:00 am | 68 | Moderate | 9.4 | 15 | 47 |
| Tue 9:00 am | 58 | Moderate | 10 | 16 | 52 |
| Tue 12:00 pm | 55 | Moderate | 7.7 | 15 | 83 |
| Tue 3:00 pm | 55 | Moderate | 9.3 | 20 | 87 |
| Tue 6:00 pm | 55 | Moderate | 15 | 31 | 62 |
| Tue 9:00 pm | 56 | Moderate | 34.8 | 56 | 9 |
| Wed 12:00 am | 62 | Moderate | 41 | 60 | 2 |
| Wed 3:00 am | 69 | Moderate | 44.5 | 59 | 0 |
| Wed 6:00 am | 77 | Moderate | 46 | 65 | 1 |
| Wed 9:00 am | 85 | Moderate | 48.3 | 72 | 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 Yima today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 9:00 pm (AQI 117, Unhealthy for Sensitive Groups) and the worst around 9:00 am (AQI 154). That is a swing of 37 points, so a run or walk around 9:00 pm is noticeably better.
Yima vs the rest of China
Across 467 China cities we track, the average US AQI right now is 86 (Moderate). Yima at 154 is 68 points worse than average.
For context, the median across 3,909 cities worldwide is 57.
Air quality in cities near Yima
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Luoyang | 51 km | 157 | Unhealthy | 76.1 |
| Changzhi, Shanxi | 54 km | 88 | Moderate | 29.5 |
| Sanmenxia | 63 km | 95 | Moderate | 32.9 |
| Yuncheng | 87 km | 95 | Moderate | 23.6 |
| Jincheng | 121 km | 107 | Unhealthy for Sensitive Groups | 30.5 |
| Yongji | 133 km | 101 | Unhealthy for Sensitive Groups | 46.6 |
| Jiaozuo | 135 km | 156 | Unhealthy | 75.4 |
| Linfen | 154 km | 73 | Moderate | 26.8 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Yima, 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 154, 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 Yima
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS).