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Air quality · Brazil

Rio de Janeiro Air Quality Index (AQI) today

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

64 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 59.

Over the next 24 hours the model expects the AQI to range from 66 around 10:00 to 205 around 18:00 (3 Nov).

449th most polluted of 849 cities worldwide right now, 6th 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 · 53 11:00 · 46 12:00 · 39 13:00 · 36 14:00 · 40 15:00 · 42 16:00 · 42 17:00 · 51 18:00 · 55 19:00 · 60 20:00 · 64 21:00 · 68 22:00 · 69 23:00 · 68 00:00 · 67 01:00 · 66 02:00 · 64 03:00 · 63 04:00 · 62 05:00 · 61 06:00 · 61 07:00 · 62 08:00 · 63 09:00 · 64 10:00 · 66 11:00 · 68 12:00 · 69 13:00 · 97 14:00 · 143 15:00 · 174 16:00 · 197 17:00 · 203 18:00 · 205 19:00 · 204 20:00 · 197 21:00 · 177 22:00 · 155 23:00 · 156 00:00 · 156 01:00 · 156 02:00 · 156 03:00 · 155 04:00 · 154 05:00 · 153 06:00 · 153 07:00 · 153 08:00 · 140 09:00 · 117 10:00 · 103 11:00 · 97 12:00 · 133 13:00 · 164 14:00 · 190 15:00 · 202 16:00 · 204 17:00 · 201 18:00 · 190 19:00 · 177 20:00 · 161 21:00 · 140 22:00 · 112 23:00 · 112 00:00 · 113 01:00 · 108 02:00 · 97 03:00 · 89 04:00 · 81 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 10:0053
Mon 11:0046
Mon 12:0039
Mon 13:0036
Mon 14:0040
Mon 15:0042
Mon 16:0042
Mon 17:0051
Mon 18:0055
Mon 19:0060
Mon 20:0064
Mon 21:0068
Mon 22:0069
Mon 23:0068
Tue 00:0067
Tue 01:0066
Tue 02:0064
Tue 03:0063
Tue 04:0062
Tue 05:0061
Tue 06:0061
Tue 07:0062
Tue 08:0063
Tue 09:00 · Now64
Tue 10:00 · Forecast66
Tue 11:00 · Forecast68
Tue 12:00 · Forecast69
Tue 13:00 · Forecast97
Tue 14:00 · Forecast143
Tue 15:00 · Forecast174
Tue 16:00 · Forecast197
Tue 17:00 · Forecast203
Tue 18:00 · Forecast205
Tue 19:00 · Forecast204
Tue 20:00 · Forecast197
Tue 21:00 · Forecast177
Tue 22:00 · Forecast155
Tue 23:00 · Forecast156
Wed 00:00 · Forecast156
Wed 01:00 · Forecast156
Wed 02:00 · Forecast156
Wed 03:00 · Forecast155
Wed 04:00 · Forecast154
Wed 05:00 · Forecast153
Wed 06:00 · Forecast153
Wed 07:00 · Forecast153
Wed 08:00 · Forecast140
Wed 09:00 · Forecast117
Wed 10:00 · Forecast103
Wed 11:00 · Forecast97
Wed 12:00 · Forecast133
Wed 13:00 · Forecast164
Wed 14:00 · Forecast190
Wed 15:00 · Forecast202
Wed 16:00 · Forecast204
Wed 17:00 · Forecast201
Wed 18:00 · Forecast190
Wed 19:00 · Forecast177
Wed 20:00 · Forecast161
Wed 21:00 · Forecast140
Wed 22:00 · Forecast112
Wed 23:00 · Forecast112
Thu 00:00 · Forecast113
Thu 01:00 · Forecast108
Thu 02:00 · Forecast97
Thu 03:00 · Forecast89
Thu 04:00 · Forecast81

Pollutants this hour

  • PM2.5 17.7 µg/m³ 24-hour mean 13.3 µg/m³ · within WHO’s 24-hour guideline (15) 64
  • PM10 18 µg/m³ 15
  • O₃ 150 µg/m³ 23
  • NO₂ 12 µg/m³ 6
  • SO₂ 7 µg/m³ 3
  • CO 0.80 mg/m³ 5

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
Nova Iguaçu Rio de Janeiro 58
São José dos Campos São Paulo 52
Belo Horizonte Minas Gerais 46
São Paulo São Paulo 71
Campinas São Paulo 81
Sorocaba São Paulo 84
Ribeirão Preto São Paulo 172

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 Rio de Janeiro’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 Rio de Janeiro right now?
64 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 Rio de Janeiro 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 Rio de Janeiro get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 66 around 10:00 to 205 around 18:00 (3 Nov). Forecasts beyond a day are less certain.

How does Rio de Janeiro compare with other cities?
Right now it is the 449th most polluted of 849 cities we track worldwide, and 6th of 25 in Brazil, all on the same US EPA scale.

Why does another app show a different AQI for Rio de Janeiro?
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.