Air quality
Air quality in Dharān today
Updated
Unhealthy for Sensitive Groups (US AQI 104) 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, 6:45 am (01:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Dharān, Koshi, Nepal, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 104 Unhealthy for Sensitive Groups
- PM2.5
- 45 µg/m³ 3× WHO 24-h guideline
- PM10
- 46 µg/m³
- Ozone
- 46 µg/m³
- Dominant pollutant
- PM2.5 sub-index 104
- Best hour today
- 2:45 pm AQI 100
- European AQI
- 57
Air quality in Dharān right now
Right now the modelled US Air Quality Index for Dharān, Koshi, Nepal is 104, 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 104. 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 45 µg/m³, 3 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 46 µg/m³ against a guideline of 45; ozone is 46 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 12 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 369 µg/m³.
Dharān AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 100 around Mon 2:45 pm to 107 around Tue 12:45 am, from "Moderate" at best to "Unhealthy for Sensitive Groups" at worst.
The following day looks similar, averaging about 102.
| Local time (Asia/Kathmandu) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 6:45 am | 104 | Unhealthy for Sensitive Groups | 44.9 | 46 | 46 |
| Mon 9:45 am | 102 | Unhealthy for Sensitive Groups | 11.1 | 12 | 129 |
| Mon 12:45 pm | 101 | Unhealthy for Sensitive Groups | 12.5 | 16 | 135 |
| Mon 3:45 pm | 100 | Moderate | 15.2 | 19 | 128 |
| Mon 6:45 pm | 101 | Unhealthy for Sensitive Groups | 42.1 | 46 | 103 |
| Mon 9:45 pm | 104 | Unhealthy for Sensitive Groups | 73.6 | 79 | 76 |
| Tue 12:45 am | 107 | Unhealthy for Sensitive Groups | 61 | 65 | 42 |
| Tue 3:45 am | 107 | Unhealthy for Sensitive Groups | 39.6 | 41 | 15 |
| Tue 6:45 am | 105 | Unhealthy for Sensitive Groups | 36.6 | 38 | 32 |
| Tue 9:45 am | 104 | Unhealthy for Sensitive Groups | 15.6 | 22 | 105 |
| Tue 12:45 pm | 104 | Unhealthy for Sensitive Groups | 11.5 | 17 | 127 |
| Tue 3:45 pm | 104 | Unhealthy for Sensitive Groups | 13.7 | 18 | 119 |
| Tue 6:45 pm | 103 | Unhealthy for Sensitive Groups | 36.2 | 39 | 98 |
| Tue 9:45 pm | 101 | Unhealthy for Sensitive Groups | 67.3 | 72 | 67 |
| Wed 12:45 am | 100 | Moderate | 61.7 | 66 | 32 |
| Wed 3:45 am | 100 | Moderate | 40.7 | 43 | 12 |
| Wed 6:45 am | 100 | Moderate | 34.9 | 37 | 28 |
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 Dharān today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 2:45 pm (AQI 100, Moderate) and the worst around 6:45 am (AQI 104). The difference across the day is small, so timing matters little.
Dharān vs the rest of Nepal
Across 4 Nepal cities we track, the average US AQI right now is 84 (Moderate). Dharān at 104 is 20 points worse than average.
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Dharān
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Siliguri | 115 km | 88 | Moderate | 26.3 |
| Darbhanga | 156 km | 155 | Unhealthy | 102.4 |
| Bhāgalpur | 177 km | 132 | Unhealthy for Sensitive Groups | 76.4 |
| Muzaffarpur | 203 km | 162 | Unhealthy | 118.7 |
| Dhāka, Bihar | 210 km | 178 | Unhealthy | 156 |
| Pātan | 217 km | 91 | Moderate | 42.6 |
| Kathmandu | 217 km | 91 | Moderate | 42.6 |
| Rangpur | 230 km | 107 | Unhealthy for Sensitive Groups | 49.5 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Dharān, 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 75 µg/m³ in the next 24 hours while NASA satellites detected 21 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 104, 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 Dharān
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.