airy.earth

Santiago air quality

Chile · Live AQI and hourly forecast for the next 5 days · updated Sat 21:00 local time

159

Unhealthy

US AQI, mostly PM2.5

Everyone should cut back on outdoor exercise. Sensitive groups should stay indoors.

Next 24 hours
77–159US AQI, highest around Sat 21:00
Best time outside
Sun 18:00–21:00US AQI about 78
PM2.5 vs WHO guideline
1.6×23 µg/m³ over 24 h, guideline 15
Cigarette equivalent
≈ 1.1 a dayBerkeley Earth rule of thumb
European AQI
Fairlevel 2 of 6

Loading the live globe…

The live globe, centred on Santiago. Switch pollutants, drag through the next 5 days or press play. Full map →

Pollutants in Santiago right now

PollutantNowNext 24 h vs WHOUS AQI band
Fine particles (PM2.5) 14 µg/m³ 1.6× Moderate
Coarse particles (PM10) 15 µg/m³ 0.5× Good
Nitrogen dioxide (NO2) 20 µg/m³ 0.8× Good
Ozone (O3) 34 µg/m³ 1.1× Good
Sulphur dioxide (SO2) 18 µg/m³ 0.7× Good
Carbon monoxide (CO) 456 µg/m³ 0.1× Good
Desert dust0 µg/m³
Smoke and haze (aerosol optical depth)0.18
UV index0.0

“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 159 around Sat 21:00, lowest 77 around Sun 20:00.

Good 0–50Moderate 51–100Sensitive 101–150Unhealthy 151–200Very unhealthy 201–300Hazardous 301+

5-day air quality forecast for Santiago

Daily range of the hourly US AQI, from lowest to highest, on a scale of 0 to 200.

DayUS AQIAt worstWorst hourPM2.5 avgUV max
Sat 26 Sept 154–174 Unhealthy 18:00 61 7.2
Sun 27 Sept 77–154 Unhealthy 0:00 24 7.8
Mon 28 Sept 76–83 Moderate 10:00 22 4.5
Tue 29 Sept 62–74 Moderate 0:00 20 6.2
Wed 30 Sept 71–85 Moderate 23:00 28 4.3

Common questions about the air in Santiago

  1. Is the air in Santiago safe today?

    No. Right now the US AQI in Santiago is 159, which counts as unhealthy. Everyone should cut back on outdoor exercise. Sensitive groups should stay indoors.

  2. When is the best time to be outside in Santiago?

    Sun 18:00–21:00. That is the cleanest stretch in the next 24 hours, with the US AQI averaging about 78. The worst hour is around Sat 21:00, at 159.

  3. What is the main pollutant in Santiago?

    Fine particles (PM2.5). It drives the index right now, at 14 µg/m³. Tiny particles from combustion, fires and dust that reach deep into the lungs. The main driver of AQI worldwide.

  4. How does Santiago's air compare with the WHO guideline?

    1.6 times the guideline. Over the next 24 hours PM2.5 averages about 23 µg/m³, against the World Health Organization's 24-hour guideline of 15 µg/m³. O3 is also forecast above its guideline level.

  5. How many cigarettes is a day of Santiago's air?

    About 1.1 cigarettes. Over the next 24 hours PM2.5 averages about 23 µg/m³. By Berkeley Earth's rule of thumb, 22 µg/m³ breathed for a day is roughly one cigarette.

  6. Will air quality in Santiago improve this week?

    Tuesday looks cleanest. Its AQI peaks at 74, against 174 on Saturday, the worst day in the forecast.

Measured near Santiago

StationDistancePM2.5 µg/m³Measured
Unnamed sensor Sensor.Community, low-cost sensor 11 km 15 Sat 20:48

Air quality near Santiago

All 161 cities

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 33.45°S, 70.67°W, updated 2026-09-27 00:00 UTC.