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Air quality · Santiago Metropolitan, Chile

Santiago Air Quality Index (AQI) today

Modelled estimate for 10:00 local time (UTC-3), refreshed 3 Nov, 07:52 UTC+0.

77 Moderate

Live estimate · modelled

US EPA AQI10:00 UTC-3, 3 Nov Main pollutant: PM2.5

Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.

This page uses EPA’s NowCast, which follows the last few hours, as the US government’s AirNow does. On a 24-hour average of particles, as many apps show, it is 77.

Over the next 24 hours the model expects the AQI to range from 63 around 14:00 to 91 around 10:00 (4 Nov).

329th most polluted of 849 cities worldwide right now.

What to do today

  • Long walk or run outside OK, lighter if very sensitive
  • Kids playing outside OK
  • Airing the house Open
  • Mask outdoors Not needed

Based on the US EPA’s health statement: “Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

11:00 · 94 12:00 · 94 13:00 · 90 14:00 · 79 15:00 · 72 16:00 · 68 17:00 · 65 18:00 · 64 19:00 · 63 20:00 · 66 21:00 · 69 22:00 · 74 23:00 · 71 00:00 · 71 01:00 · 74 02:00 · 79 03:00 · 82 04:00 · 84 05:00 · 85 06:00 · 86 07:00 · 87 08:00 · 89 09:00 · 82 10:00 · 77 11:00 · 70 12:00 · 65 13:00 · 64 14:00 · 63 15:00 · 63 16:00 · 64 17:00 · 66 18:00 · 67 19:00 · 67 20:00 · 67 21:00 · 68 22:00 · 68 23:00 · 68 00:00 · 69 01:00 · 71 02:00 · 74 03:00 · 76 04:00 · 77 05:00 · 77 06:00 · 77 07:00 · 77 08:00 · 80 09:00 · 83 10:00 · 91 11:00 · 99 12:00 · 99 13:00 · 93 14:00 · 83 15:00 · 76 16:00 · 71 17:00 · 67 18:00 · 71 19:00 · 64 20:00 · 62 21:00 · 67 22:00 · 74 23:00 · 81 00:00 · 92 01:00 · 105 02:00 · 116 03:00 · 123 04:00 · 127 Now

US EPA AQI per hour, UTC-3. Particles use EPA’s NowCast (a 12-hour weighted average), ozone and CO an 8-hour average. Lighter bars are the CAMS forecast.

Show as a table
TimeAQI
Mon 11:0094
Mon 12:0094
Mon 13:0090
Mon 14:0079
Mon 15:0072
Mon 16:0068
Mon 17:0065
Mon 18:0064
Mon 19:0063
Mon 20:0066
Mon 21:0069
Mon 22:0074
Mon 23:0071
Tue 00:0071
Tue 01:0074
Tue 02:0079
Tue 03:0082
Tue 04:0084
Tue 05:0085
Tue 06:0086
Tue 07:0087
Tue 08:0089
Tue 09:0082
Tue 10:00 · Now77
Tue 11:00 · Forecast70
Tue 12:00 · Forecast65
Tue 13:00 · Forecast64
Tue 14:00 · Forecast63
Tue 15:00 · Forecast63
Tue 16:00 · Forecast64
Tue 17:00 · Forecast66
Tue 18:00 · Forecast67
Tue 19:00 · Forecast67
Tue 20:00 · Forecast67
Tue 21:00 · Forecast68
Tue 22:00 · Forecast68
Tue 23:00 · Forecast68
Wed 00:00 · Forecast69
Wed 01:00 · Forecast71
Wed 02:00 · Forecast74
Wed 03:00 · Forecast76
Wed 04:00 · Forecast77
Wed 05:00 · Forecast77
Wed 06:00 · Forecast77
Wed 07:00 · Forecast77
Wed 08:00 · Forecast80
Wed 09:00 · Forecast83
Wed 10:00 · Forecast91
Wed 11:00 · Forecast99
Wed 12:00 · Forecast99
Wed 13:00 · Forecast93
Wed 14:00 · Forecast83
Wed 15:00 · Forecast76
Wed 16:00 · Forecast71
Wed 17:00 · Forecast67
Wed 18:00 · Forecast71
Wed 19:00 · Forecast64
Wed 20:00 · Forecast62
Wed 21:00 · Forecast67
Wed 22:00 · Forecast74
Wed 23:00 · Forecast81
Thu 00:00 · Forecast92
Thu 01:00 · Forecast105
Thu 02:00 · Forecast116
Thu 03:00 · Forecast123
Thu 04:00 · Forecast127

Pollutants this hour

  • PM2.5 18.6 µg/m³ 24-hour mean 23.1 µg/m³ · 1.5× WHO’s 24-hour guideline (15) 77
  • PM10 22 µg/m³ 24
  • O₃ 52 µg/m³ 11
  • NO₂ 23 µg/m³ 11
  • SO₂ 38 µg/m³ 20
  • CO 0.85 mg/m³ 9

Modelled concentrations at the city’s location (CAMS). The sub-index uses the same averaging as the headline, so the highest one is the AQI.

Nearby cities

City AQI
Córdoba Argentina 71
Rosario Argentina 36
Buenos Aires Argentina 56
Montevideo Uruguay 37
Asunción Paraguay 21
Sucre Bolivia 19
Cochabamba Bolivia 19

Where this number comes from

The Copernicus Atmosphere Monitoring Service (CAMS) forecasts air pollution worldwide on a grid (about 11 km over Europe, about 45 km elsewhere). We take the grid value at Santiago’s coordinates and score it with the US EPA’s method. It is a model, not a measurement: a nearby monitoring station can read quite differently, especially next to busy roads or during fires and dust storms.

Full methodology · Data: CAMS via Open-Meteo (CC BY 4.0); city list: GeoNames (CC BY 4.0).

  • Good 0–50
  • Moderate 51–100
  • Unhealthy for sensitive groups 101–150
  • Unhealthy 151–200
  • Very unhealthy 201–300
  • Hazardous 301–500

Questions

What is the AQI in Santiago right now?
77 on the US EPA scale (Moderate) at 10:00 UTC-3, 3 Nov. PM2.5 is the pollutant with the highest sub-index. This is a modelled estimate from the Copernicus Atmosphere Monitoring Service (CAMS), not a reading from a monitoring station.

Is it safe to exercise outside in Santiago today?
For most people, yes. The EPA’s statement for “Moderate”: Air quality is acceptable. However, there may be a risk for some people, particularly those who are unusually sensitive to air pollution. General guidance, not medical advice.

Will the air in Santiago get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 63 around 14:00 to 91 around 10:00 (4 Nov). Forecasts beyond a day are less certain.

How does Santiago compare with other cities?
Right now it is the 329th most polluted of 849 cities we track worldwide, all on the same US EPA scale.

Why does another app show a different AQI for Santiago?
Apps differ in source (government stations, low-cost sensors or a model like this one), in scale (US EPA, European, or a national index) and in averaging (hourly or NowCast, 8-hour, 24-hour). This page uses the US EPA AQI with EPA’s NowCast for particles, computed from the CAMS forecast for the city’s location.