Air quality
Air quality in Pematangsiantar today
Updated
Moderate (US AQI 84) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Mon, Oct 26, 3:00 am (20:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Pematangsiantar, North Sumatra, Indonesia, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 84 Moderate
- PM2.5
- 54 µg/m³ 3.6× WHO 24-h guideline
- PM10
- 54 µg/m³
- Ozone
- 17 µg/m³
- Dominant pollutant
- PM2.5 sub-index 84
- Best hour today
- 6:00 am AQI 92
- European AQI
- 62
Air quality in Pematangsiantar right now
Right now the modelled US Air Quality Index for Pematangsiantar, North Sumatra, Indonesia is 84, 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 84. 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 54 µg/m³, 3.6 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 54 µg/m³ against a guideline of 45; ozone is 17 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 22 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 857 µg/m³.
Pematangsiantar AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 83 around Tue 3:00 am to 99 around Mon 9:00 am, staying "Moderate" throughout.
The following day is expected to be cleaner, averaging about 75 against 95 for the next 24 hours.
| Local time (Asia/Jakarta) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Mon 3:00 am | 84 | Moderate | 53.8 | 54 | 17 |
| Mon 6:00 am | 92 | Moderate | 57.2 | 58 | 22 |
| Mon 9:00 am | 99 | Moderate | 14 | 15 | 50 |
| Mon 12:00 pm | 99 | Moderate | 8.7 | 9 | 77 |
| Mon 3:00 pm | 99 | Moderate | 8.5 | 9 | 70 |
| Mon 6:00 pm | 99 | Moderate | 16.6 | 17 | 49 |
| Mon 9:00 pm | 97 | Moderate | 34.6 | 35 | 32 |
| Tue 12:00 am | 91 | Moderate | 24.4 | 25 | 29 |
| Tue 3:00 am | 83 | Moderate | 27.1 | 27 | 17 |
| Tue 6:00 am | 77 | Moderate | 38.4 | 39 | 5 |
| Tue 9:00 am | 76 | Moderate | 14.5 | 15 | 68 |
| Tue 12:00 pm | 75 | Moderate | 8 | 8 | 96 |
| Tue 3:00 pm | 75 | Moderate | 8.4 | 8 | 88 |
| Tue 6:00 pm | 75 | Moderate | 13.5 | 14 | 63 |
| Tue 9:00 pm | 73 | Moderate | 19.8 | 20 | 53 |
| Wed 12:00 am | 71 | Moderate | 34.5 | 35 | 32 |
| Wed 3:00 am | 75 | Moderate | 37.7 | 38 | 20 |
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 Pematangsiantar today
Between 6 am and 9 pm local time, the cleanest air today is forecast around 6:00 am (AQI 92, Moderate) and the worst around 9:00 am (AQI 99). The difference across the day is small, so timing matters little.
Pematangsiantar vs the rest of Indonesia
Across 80 Indonesia cities we track, the average US AQI right now is 124 (Unhealthy for Sensitive Groups). Pematangsiantar at 84 is 40 points cleaner than average.
It ranks 29 of 80 from cleanest to most polluted; the cleanest is Banda Aceh (30) and the most polluted Palangkaraya (500).
For context, the median across 3,909 cities worldwide is 56.
Air quality in cities near Pematangsiantar
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Percut | 77 km | 108 | Unhealthy for Sensitive Groups | 54.1 |
| Medan | 82 km | 108 | Unhealthy for Sensitive Groups | 54.1 |
| Sunggal | 85 km | 85 | Moderate | 37.5 |
| Binjai | 96 km | 85 | Moderate | 37.5 |
| Belawan | 100 km | 108 | Unhealthy for Sensitive Groups | 54.1 |
| Kapar | 258 km | 65 | Moderate | 4.9 |
| Ijok | 262 km | 65 | Moderate | 4.9 |
| Bandar Bukit Raja | 263 km | 65 | Moderate | 4.9 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Pematangsiantar, 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 84, 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 Pematangsiantar
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS).