Air quality
Air quality in Aley today
Updated
Unhealthy for Sensitive Groups (US AQI 135) 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, 10:00 pm (20:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Aley, Mount Lebanon, Lebanon, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 135 Unhealthy for Sensitive Groups
- PM2.5
- 56 µg/m³ 3.7× WHO 24-h guideline
- PM10
- 89 µg/m³
- Ozone
- 42 µg/m³
- Dominant pollutant
- PM2.5 sub-index 135
- Best hour tomorrow
- 1:00 pm AQI 127
- European AQI
- 63
Air quality in Aley right now
Right now the modelled US Air Quality Index for Aley, Mount Lebanon, Lebanon is 135, 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 135. 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 56 µg/m³, 3.7 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 89 µg/m³ against a guideline of 45; ozone is 42 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 23 µg/m³ (below the 24-hour guideline of 25).
Also this hour: carbon monoxide 310 µg/m³.
Aley AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 125 around Mon 10:00 pm to 136 around Sun 11:00 pm, staying "Unhealthy for Sensitive Groups" throughout.
The following day is expected to be cleaner, averaging about 115 against 131 for the next 24 hours.
| Local time (Asia/Beirut) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Sun 10:00 pm | 135 | Unhealthy for Sensitive Groups | 55.5 | 89 | 42 |
| Mon 1:00 am | 136 | Unhealthy for Sensitive Groups | 50 | 87 | 19 |
| Mon 4:00 am | 134 | Unhealthy for Sensitive Groups | 40.8 | 76 | 28 |
| Mon 7:00 am | 133 | Unhealthy for Sensitive Groups | 37 | 76 | 30 |
| Mon 10:00 am | 129 | Unhealthy for Sensitive Groups | 38.6 | 84 | 55 |
| Mon 1:00 pm | 127 | Unhealthy for Sensitive Groups | 49.5 | 78 | 93 |
| Mon 4:00 pm | 127 | Unhealthy for Sensitive Groups | 56.3 | 93 | 90 |
| Mon 7:00 pm | 129 | Unhealthy for Sensitive Groups | 47.7 | 82 | 85 |
| Mon 10:00 pm | 125 | Unhealthy for Sensitive Groups | 41.2 | 54 | 57 |
| Tue 1:00 am | 121 | Unhealthy for Sensitive Groups | 35.7 | 53 | 13 |
| Tue 4:00 am | 119 | Unhealthy for Sensitive Groups | 40.3 | 60 | 16 |
| Tue 7:00 am | 119 | Unhealthy for Sensitive Groups | 35.8 | 59 | 22 |
| Tue 10:00 am | 119 | Unhealthy for Sensitive Groups | 36.1 | 60 | 56 |
| Tue 1:00 pm | 117 | Unhealthy for Sensitive Groups | 37.5 | 46 | 87 |
| Tue 4:00 pm | 111 | Unhealthy for Sensitive Groups | 19.3 | 24 | 75 |
| Tue 7:00 pm | 100 | Moderate | 28.1 | 32 | 51 |
| Tue 10:00 pm | 96 | Moderate | 31.7 | 42 | 39 |
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 Aley tomorrow
Between 6 am and 9 pm local time, the cleanest air tomorrow is forecast around 1:00 pm (AQI 127, Unhealthy for Sensitive Groups) and the worst around 6:00 am (AQI 133). The difference across the day is small, so timing matters little.
Air quality in cities near Aley
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Beirut | 13 km | 121 | Unhealthy for Sensitive Groups | 48.5 |
| Damascus | 72 km | 89 | Moderate | 29.3 |
| Ţarţūs | 123 km | 76 | Moderate | 25.6 |
| Haifa | 124 km | 74 | Moderate | 13.9 |
| Irbid | 141 km | 101 | Unhealthy for Sensitive Groups | 37.7 |
| Homs | 145 km | 88 | Moderate | 31.4 |
| Ḩamāh | 182 km | 77 | Moderate | 25.6 |
| Latakia | 193 km | 73 | Moderate | 23.3 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Aley, 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 61 µg/m³ in the next 24 hours while NASA satellites detected 32 fire hotspots within 300 km in the last day (nearest about 46 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 135, 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 Aley
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.