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Air quality · Rio de Janeiro, Brazil

Nova Iguaçu Air Quality Index (AQI) today

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

58 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 58.

Over the next 24 hours the model expects the AQI to range from 62 around 10:00 to 221 around 17:00 (3 Nov).

519th most polluted of 849 cities worldwide right now, 7th 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 · 51 11:00 · 52 12:00 · 53 13:00 · 54 14:00 · 61 15:00 · 67 16:00 · 67 17:00 · 54 18:00 · 56 19:00 · 60 20:00 · 63 21:00 · 66 22:00 · 67 23:00 · 66 00:00 · 65 01:00 · 64 02:00 · 63 03:00 · 62 04:00 · 61 05:00 · 58 06:00 · 56 07:00 · 55 08:00 · 56 09:00 · 58 10:00 · 62 11:00 · 72 12:00 · 93 13:00 · 151 14:00 · 192 15:00 · 210 16:00 · 219 17:00 · 221 18:00 · 219 19:00 · 210 20:00 · 195 21:00 · 161 22:00 · 122 23:00 · 111 00:00 · 114 01:00 · 121 02:00 · 128 03:00 · 129 04:00 · 131 05:00 · 131 06:00 · 132 07:00 · 131 08:00 · 127 09:00 · 119 10:00 · 115 11:00 · 110 12:00 · 129 13:00 · 174 14:00 · 204 15:00 · 215 16:00 · 219 17:00 · 218 18:00 · 213 19:00 · 205 20:00 · 187 21:00 · 159 22:00 · 122 23:00 · 109 00:00 · 116 01:00 · 116 02:00 · 110 03:00 · 100 04:00 · 91 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 10:0051
Mon 11:0052
Mon 12:0053
Mon 13:0054
Mon 14:0061
Mon 15:0067
Mon 16:0067
Mon 17:0054
Mon 18:0056
Mon 19:0060
Mon 20:0063
Mon 21:0066
Mon 22:0067
Mon 23:0066
Tue 00:0065
Tue 01:0064
Tue 02:0063
Tue 03:0062
Tue 04:0061
Tue 05:0058
Tue 06:0056
Tue 07:0055
Tue 08:0056
Tue 09:00 · Now58
Tue 10:00 · Forecast62
Tue 11:00 · Forecast72
Tue 12:00 · Forecast93
Tue 13:00 · Forecast151
Tue 14:00 · Forecast192
Tue 15:00 · Forecast210
Tue 16:00 · Forecast219
Tue 17:00 · Forecast221
Tue 18:00 · Forecast219
Tue 19:00 · Forecast210
Tue 20:00 · Forecast195
Tue 21:00 · Forecast161
Tue 22:00 · Forecast122
Tue 23:00 · Forecast111
Wed 00:00 · Forecast114
Wed 01:00 · Forecast121
Wed 02:00 · Forecast128
Wed 03:00 · Forecast129
Wed 04:00 · Forecast131
Wed 05:00 · Forecast131
Wed 06:00 · Forecast132
Wed 07:00 · Forecast131
Wed 08:00 · Forecast127
Wed 09:00 · Forecast119
Wed 10:00 · Forecast115
Wed 11:00 · Forecast110
Wed 12:00 · Forecast129
Wed 13:00 · Forecast174
Wed 14:00 · Forecast204
Wed 15:00 · Forecast215
Wed 16:00 · Forecast219
Wed 17:00 · Forecast218
Wed 18:00 · Forecast213
Wed 19:00 · Forecast205
Wed 20:00 · Forecast187
Wed 21:00 · Forecast159
Wed 22:00 · Forecast122
Wed 23:00 · Forecast109
Thu 00:00 · Forecast116
Thu 01:00 · Forecast116
Thu 02:00 · Forecast110
Thu 03:00 · Forecast100
Thu 04:00 · Forecast91

Pollutants this hour

  • PM2.5 14.0 µg/m³ 24-hour mean 13.2 µg/m³ · within WHO’s 24-hour guideline (15) 58
  • PM10 14 µg/m³ 11
  • O₃ 154 µg/m³ 21
  • NO₂ 8 µg/m³ 4
  • SO₂ 5 µg/m³ 1
  • CO 0.27 mg/m³ 3

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
Rio de Janeiro Rio de Janeiro 64
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 Nova Iguaçu’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 Nova Iguaçu right now?
58 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 Nova Iguaçu 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 Nova Iguaçu get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 62 around 10:00 to 221 around 17:00 (3 Nov). Forecasts beyond a day are less certain.

How does Nova Iguaçu compare with other cities?
Right now it is the 519th most polluted of 849 cities we track worldwide, and 7th of 25 in Brazil, all on the same US EPA scale.

Why does another app show a different AQI for Nova Iguaçu?
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.