Buenos Aires air quality
Argentina · Live AQI and hourly forecast for the next 5 days · updated Sat 20:00 local time
Moderate
Acceptable. Unusually sensitive people should ease off long, intense outdoor effort.
- Next 24 hours
- 27–53US AQI, highest around Sat 20:00
- Best time outside
- Sun 11:00–14:00US AQI about 27
- PM2.5 vs WHO guideline
- 0.3×4.9 µg/m³ over 24 h, guideline 15
- Cigarette equivalent
- ≈ 0.2 a dayBerkeley Earth rule of thumb
- European AQI
- Fairlevel 2 of 6
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Pollutants in Buenos Aires right now
| Pollutant | Now | Next 24 h vs WHO | US AQI band |
|---|---|---|---|
| Fine particles (PM2.5) | 7.8 µg/m³ | 0.3× | Good |
| Coarse particles (PM10) | 10 µg/m³ | 0.1× | Good |
| Nitrogen dioxide (NO2) | 15 µg/m³ | 0.3× | Good |
| Ozone (O3) | 45 µg/m³ | 0.5× | Good |
| Sulphur dioxide (SO2) | 4.4 µg/m³ | 0.1× | Good |
| Carbon monoxide (CO) | 124 µg/m³ | 0.0× | Good |
| Desert dust | 0 µg/m³ | ||
| Smoke and haze (aerosol optical depth) | 0.19 | ||
| UV index | 0.0 |
“Next 24 h vs WHO” compares the forecast with the World Health Organization’s 2021 guideline levels: 24-hour means of 15 µg/m³ for PM2.5, 45 for PM10, 25 for NO2, 40 for SO2 and 4 mg/m³ for CO, and 100 µg/m³ over 8 hours for ozone. Above 1× is above the guideline.
Next 48 hours
Hourly US AQI. Highest 53 around Sat 20:00, lowest 27 around Sun 11:00.
5-day air quality forecast for Buenos Aires
Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 150.
| Day | US AQI | At worst | PM2.5 avg | |
|---|---|---|---|---|
| Sat 26 Sept | 50–60 | 8.3 | ||
| Sun 27 Sept | 27–46 | 5.1 | ||
| Mon 28 Sept | 28–44 | 7.8 | ||
| Tue 29 Sept | 25–43 | 4.3 | ||
| Wed 30 Sept | 19–25 | 5.1 |
Common questions about the air in Buenos Aires
Is the air in Buenos Aires safe today?
For most people, yes. Right now the US AQI in Buenos Aires is 53, which counts as moderate. Acceptable. Unusually sensitive people should ease off long, intense outdoor effort.
When is the best time to be outside in Buenos Aires?
Sun 11:00–14:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 27. The worst hour is around Sat 20:00, at 53.
What is the main pollutant in Buenos Aires?
Fine particles (PM2.5). It drives the index right now, at 7.8 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.
How does Buenos Aires's air compare with the WHO guideline?
Within the guideline. Over the next 24 hours PM2.5 averages about 4.9 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. The other pollutants stay within their guideline levels.
How many cigarettes is a day of Buenos Aires's air?
About 0.2 cigarettes. Over the next 24 hours PM2.5 averages about 4.9 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.
Will air quality in Buenos Aires improve this week?
Wednesday looks cleanest. Its AQI peaks at 25, against 60 on Saturday, the worst day in the forecast.
Air quality near Buenos Aires
- Santiago 1,139 km W
- São Paulo 1,675 km NE
- Rio de Janeiro 1,968 km NE
- La Paz 2,235 km NW
- Lima 3,137 km NW
- Quito 4,360 km NW
About this forecast
Forecast from CAMS global via Open-Meteo: the Copernicus Atmosphere Monitoring Service (CAMS) model at about 40 km resolution (10 km inside Europe), refreshed twice a day. Models smooth out street-level peaks, so busy roads and industrial sites can be worse than shown; ground stations, where there are any nearby, show what monitors actually measure. The US AQI follows the US EPA scale and the European AQI the EEA bands. Readings for 34.60°S, 58.38°W, updated 2026-09-26 23:00 UTC.