Air quality
Air quality in Golestān today
Updated
Unhealthy for Sensitive Groups (US AQI 136) People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. Model estimate for Sun, Oct 25, 9:30 pm (18:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Golestān, Tehran, Iran, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 136 Unhealthy for Sensitive Groups
- PM2.5
- 63 µg/m³ 4.2× WHO 24-h guideline
- PM10
- 69 µg/m³
- Ozone
- 5 µg/m³
- Dominant pollutant
- PM2.5 sub-index 136
- Best hour tomorrow
- 8:30 am AQI 128
- European AQI
- 85
Air quality in Golestān right now
Right now the modelled US Air Quality Index for Golestān, Tehran, Iran is 136, 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 136. 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 63 µg/m³, 4.2 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 69 µg/m³ against a guideline of 45; ozone is 5 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 114 µg/m³ (above the 24-hour guideline of 25).
Also this hour: sulphur dioxide at 72 µg/m³, carbon monoxide 271 µg/m³.
Golestān AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 128 around Mon 8:30 am to 136 around Sun 9:30 pm, staying "Unhealthy for Sensitive Groups" throughout.
The following day is expected to be worse, averaging about 152 against 130 for the next 24 hours.
| Local time (Asia/Tehran) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Sun 9:30 pm | 136 | Unhealthy for Sensitive Groups | 62.9 | 69 | 5 |
| Mon 12:30 am | 132 | Unhealthy for Sensitive Groups | 69.4 | 74 | 0 |
| Mon 3:30 am | 131 | Unhealthy for Sensitive Groups | 50.2 | 54 | 0 |
| Mon 6:30 am | 129 | Unhealthy for Sensitive Groups | 56.5 | 60 | 1 |
| Mon 9:30 am | 129 | Unhealthy for Sensitive Groups | 34.9 | 48 | 39 |
| Mon 12:30 pm | 129 | Unhealthy for Sensitive Groups | 20.6 | 35 | 99 |
| Mon 3:30 pm | 129 | Unhealthy for Sensitive Groups | 20.8 | 34 | 96 |
| Mon 6:30 pm | 128 | Unhealthy for Sensitive Groups | 48.1 | 59 | 12 |
| Mon 9:30 pm | 136 | Unhealthy for Sensitive Groups | 121.5 | 133 | 2 |
| Tue 12:30 am | 151 | Unhealthy | 96.2 | 99 | 0 |
| Tue 3:30 am | 152 | Unhealthy | 53.8 | 57 | 1 |
| Tue 6:30 am | 152 | Unhealthy | 65 | 67 | 1 |
| Tue 9:30 am | 153 | Unhealthy | 43.1 | 52 | 30 |
| Tue 12:30 pm | 154 | Unhealthy | 27.9 | 41 | 102 |
| Tue 3:30 pm | 154 | Unhealthy | 26.8 | 39 | 105 |
| Tue 6:30 pm | 155 | Unhealthy | 60.5 | 70 | 9 |
| Tue 9:30 pm | 156 | Unhealthy | 127.1 | 137 | 0 |
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 Golestān tomorrow
Between 6 am and 9 pm local time, the cleanest air tomorrow is forecast around 8:30 am (AQI 128, Unhealthy for Sensitive Groups) and the worst around 9:30 pm (AQI 136). The difference across the day is small, so timing matters little.
Golestān vs the rest of Iran
Across 35 Iran cities we track, the average US AQI right now is 75 (Moderate). Golestān at 136 is 61 points worse than average.
It ranks 34 of 35 from cleanest to most polluted; the cleanest is Ardabīl (28) and the most polluted Nasimshahr (136).
For context, the median across 3,909 cities worldwide is 57.
Air quality in cities near Golestān
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Nasimshahr | 6 km | 136 | Unhealthy for Sensitive Groups | 62.9 |
| Eslamshahr | 6 km | 136 | Unhealthy for Sensitive Groups | 62.9 |
| Shahrīār | 19 km | 73 | Moderate | 33.9 |
| Shahre Jadide Andisheh | 23 km | 73 | Moderate | 33.9 |
| Qods | 24 km | 73 | Moderate | 33.9 |
| Tehran | 29 km | 98 | Moderate | 49.2 |
| Fardīs | 31 km | 73 | Moderate | 33.9 |
| Moḩammad Shahr | 36 km | 73 | Moderate | 33.9 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Golestān, 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 122 µg/m³ in the next 24 hours while NASA satellites detected 20 fire hotspots within 300 km in the last day (nearest about 22 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 136, 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 Golestān
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.