Air quality
Air quality in Khomeynī Shahr today
Updated
Moderate (US AQI 98) Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. Model estimate for Sun, Oct 25, 9:30 pm (18:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Khomeynī Shahr, Isfahan, Iran, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 98 Moderate
- PM2.5
- 36 µg/m³ 2.4× WHO 24-h guideline
- PM10
- 53 µg/m³
- Ozone
- 5 µg/m³
- Dominant pollutant
- PM2.5 sub-index 98
- Best hour tomorrow
- 5:30 pm AQI 85
- European AQI
- 78
Air quality in Khomeynī Shahr right now
Right now the modelled US Air Quality Index for Khomeynī Shahr, Isfahan, Iran is 98, 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 98. 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 36 µg/m³, 2.4 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 53 µg/m³ against a guideline of 45; ozone is 5 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 96 µg/m³ (above the 24-hour guideline of 25).
Also this hour: sulphur dioxide at 47 µg/m³, carbon monoxide 821 µg/m³.
Khomeynī Shahr AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 85 around Mon 5:30 pm to 98 around Sun 9:30 pm, staying "Moderate" throughout.
The following day is expected to be worse, averaging about 96 against 89 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 | 98 | Moderate | 36.1 | 53 | 5 |
| Mon 12:30 am | 92 | Moderate | 34.8 | 52 | 4 |
| Mon 3:30 am | 87 | Moderate | 28.5 | 45 | 1 |
| Mon 6:30 am | 86 | Moderate | 38 | 50 | 1 |
| Mon 9:30 am | 88 | Moderate | 29.5 | 47 | 32 |
| Mon 12:30 pm | 88 | Moderate | 14.3 | 34 | 103 |
| Mon 3:30 pm | 87 | Moderate | 10.5 | 30 | 101 |
| Mon 6:30 pm | 86 | Moderate | 45.6 | 63 | 0 |
| Mon 9:30 pm | 91 | Moderate | 56.1 | 69 | 0 |
| Tue 12:30 am | 95 | Moderate | 44.7 | 53 | 0 |
| Tue 3:30 am | 97 | Moderate | 27.8 | 34 | 0 |
| Tue 6:30 am | 96 | Moderate | 31.8 | 38 | 1 |
| Tue 9:30 am | 95 | Moderate | 28.2 | 42 | 22 |
| Tue 12:30 pm | 95 | Moderate | 18.7 | 43 | 94 |
| Tue 3:30 pm | 97 | Moderate | 16.8 | 40 | 98 |
| Tue 6:30 pm | 99 | Moderate | 38.1 | 52 | 0 |
| Tue 9:30 pm | 95 | Moderate | 34.1 | 44 | 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 Khomeynī Shahr tomorrow
Between 6 am and 9 pm local time, the cleanest air tomorrow is forecast around 5:30 pm (AQI 85, Moderate) and the worst around 9:30 pm (AQI 91). The difference across the day is small, so timing matters little.
Khomeynī Shahr vs the rest of Iran
Across 35 Iran cities we track, the average US AQI right now is 75 (Moderate). Khomeynī Shahr at 98 is 23 points worse than average.
It ranks 30 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 Khomeynī Shahr
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Isfahan | 13 km | 98 | Moderate | 36.1 |
| Shāhīn Shahr | 19 km | 98 | Moderate | 36.1 |
| Kashan | 145 km | 59 | Moderate | 13.8 |
| Kāshān, Isfahan | 147 km | 59 | Moderate | 13.8 |
| Qom | 226 km | 69 | Moderate | 13.2 |
| Arāk | 232 km | 58 | Moderate | 10.4 |
| Yazd | 280 km | 63 | Moderate | 15.1 |
| Ahvaz | 309 km | 89 | Moderate | 26 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Khomeynī Shahr, 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 57 µg/m³ in the next 24 hours while NASA satellites detected 199 fire hotspots within 300 km in the last day (nearest about 31 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 98, 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 Khomeynī Shahr
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.