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Air quality · Rio Grande do Sul, Brazil

Porto Alegre Air Quality Index (AQI) today

Modelled estimate for 09:00 local time (UTC-3), refreshed 3 Nov, 07:52 UTC+0.

51 Moderate

Live estimate · modelled

US EPA AQI09:00 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 44.

Over the next 24 hours the model expects the AQI to range from 28 around 04:00 to 49 around 10:00 (3 Nov).

649th most polluted of 849 cities worldwide right now, 13th of 25 in Brazil.

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

10:00 · 28 11:00 · 30 12:00 · 35 13:00 · 41 14:00 · 46 15:00 · 51 16:00 · 61 17:00 · 67 18:00 · 67 19:00 · 61 20:00 · 53 21:00 · 52 22:00 · 51 23:00 · 51 00:00 · 51 01:00 · 51 02:00 · 52 03:00 · 52 04:00 · 53 05:00 · 53 06:00 · 53 07:00 · 53 08:00 · 52 09:00 · 51 10:00 · 49 11:00 · 48 12:00 · 48 13:00 · 49 14:00 · 48 15:00 · 47 16:00 · 45 17:00 · 44 18:00 · 43 19:00 · 42 20:00 · 38 21:00 · 36 22:00 · 34 23:00 · 34 00:00 · 34 01:00 · 33 02:00 · 32 03:00 · 30 04:00 · 28 05:00 · 28 06:00 · 28 07:00 · 28 08:00 · 29 09:00 · 31 10:00 · 33 11:00 · 35 12:00 · 35 13:00 · 31 14:00 · 30 15:00 · 32 16:00 · 35 17:00 · 36 18:00 · 45 19:00 · 54 20:00 · 57 21:00 · 55 22:00 · 53 23:00 · 49 00:00 · 44 01:00 · 38 02:00 · 33 03:00 · 30 04:00 · 28 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 10:0028
Mon 11:0030
Mon 12:0035
Mon 13:0041
Mon 14:0046
Mon 15:0051
Mon 16:0061
Mon 17:0067
Mon 18:0067
Mon 19:0061
Mon 20:0053
Mon 21:0052
Mon 22:0051
Mon 23:0051
Tue 00:0051
Tue 01:0051
Tue 02:0052
Tue 03:0052
Tue 04:0053
Tue 05:0053
Tue 06:0053
Tue 07:0053
Tue 08:0052
Tue 09:00 · Now51
Tue 10:00 · Forecast49
Tue 11:00 · Forecast48
Tue 12:00 · Forecast48
Tue 13:00 · Forecast49
Tue 14:00 · Forecast48
Tue 15:00 · Forecast47
Tue 16:00 · Forecast45
Tue 17:00 · Forecast44
Tue 18:00 · Forecast43
Tue 19:00 · Forecast42
Tue 20:00 · Forecast38
Tue 21:00 · Forecast36
Tue 22:00 · Forecast34
Tue 23:00 · Forecast34
Wed 00:00 · Forecast34
Wed 01:00 · Forecast33
Wed 02:00 · Forecast32
Wed 03:00 · Forecast30
Wed 04:00 · Forecast28
Wed 05:00 · Forecast28
Wed 06:00 · Forecast28
Wed 07:00 · Forecast28
Wed 08:00 · Forecast29
Wed 09:00 · Forecast31
Wed 10:00 · Forecast33
Wed 11:00 · Forecast35
Wed 12:00 · Forecast35
Wed 13:00 · Forecast31
Wed 14:00 · Forecast30
Wed 15:00 · Forecast32
Wed 16:00 · Forecast35
Wed 17:00 · Forecast36
Wed 18:00 · Forecast45
Wed 19:00 · Forecast54
Wed 20:00 · Forecast57
Wed 21:00 · Forecast55
Wed 22:00 · Forecast53
Wed 23:00 · Forecast49
Thu 00:00 · Forecast44
Thu 01:00 · Forecast38
Thu 02:00 · Forecast33
Thu 03:00 · Forecast30
Thu 04:00 · Forecast28

Pollutants this hour

  • PM2.5 8.0 µg/m³ 24-hour mean 8.1 µg/m³ · within WHO’s 24-hour guideline (15) 51
  • PM10 10 µg/m³ 9
  • O₃ 75 µg/m³ 26
  • NO₂ 5 µg/m³ 2
  • SO₂ 3 µg/m³ 1
  • CO 0.23 mg/m³ 1

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
Curitiba Paraná 57
Montevideo Uruguay 44
Sorocaba São Paulo 84
Asunción Paraguay 22
Buenos Aires Argentina 64
São Paulo São Paulo 71
Campinas São Paulo 81

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 Porto Alegre’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 Porto Alegre right now?
51 on the US EPA scale (Moderate) at 09:00 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 Porto Alegre 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 Porto Alegre get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 28 around 04:00 to 49 around 10:00 (3 Nov). Forecasts beyond a day are less certain.

How does Porto Alegre compare with other cities?
Right now it is the 649th most polluted of 849 cities we track worldwide, and 13th of 25 in Brazil, all on the same US EPA scale.

Why does another app show a different AQI for Porto Alegre?
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.