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Air quality · São Paulo, Brazil

Ribeirão Preto Air Quality Index (AQI) today

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

172 Unhealthy

Live estimate · modelled

US EPA AQI09:00 UTC-3, 3 Nov Main pollutant: PM2.5

Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects.

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 177.

Over the next 24 hours the model expects the AQI to range from 73 around 13:00 to 261 around 06:00 (4 Nov).

27th most polluted of 849 cities worldwide right now, 1st of 25 in Brazil.

What to do today

  • Long walk or run outside Shorten it, take breaks
  • Kids playing outside Limit it
  • Airing the house Open briefly
  • Mask outdoors N95 if outside for long

Based on the US EPA’s health statement: “Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects.” General guidance, not medical advice.

Last 24 hours and next 48

Past hours Forecast

10:00 · 72 11:00 · 64 12:00 · 62 13:00 · 65 14:00 · 69 15:00 · 71 16:00 · 74 17:00 · 84 18:00 · 92 19:00 · 104 20:00 · 104 21:00 · 120 22:00 · 158 23:00 · 178 00:00 · 200 01:00 · 235 02:00 · 270 03:00 · 298 04:00 · 307 05:00 · 288 06:00 · 262 07:00 · 240 08:00 · 204 09:00 · 172 10:00 · 146 11:00 · 102 12:00 · 83 13:00 · 73 14:00 · 84 15:00 · 108 16:00 · 119 17:00 · 115 18:00 · 104 19:00 · 162 20:00 · 186 21:00 · 202 22:00 · 211 23:00 · 209 00:00 · 203 01:00 · 199 02:00 · 203 03:00 · 211 04:00 · 223 05:00 · 244 06:00 · 261 07:00 · 244 08:00 · 197 09:00 · 166 10:00 · 136 11:00 · 98 12:00 · 82 13:00 · 84 14:00 · 115 15:00 · 136 16:00 · 140 17:00 · 126 18:00 · 100 19:00 · 152 20:00 · 174 21:00 · 194 22:00 · 220 23:00 · 251 00:00 · 279 01:00 · 286 02:00 · 261 03:00 · 225 04:00 · 192 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 10:0072
Mon 11:0064
Mon 12:0062
Mon 13:0065
Mon 14:0069
Mon 15:0071
Mon 16:0074
Mon 17:0084
Mon 18:0092
Mon 19:00104
Mon 20:00104
Mon 21:00120
Mon 22:00158
Mon 23:00178
Tue 00:00200
Tue 01:00235
Tue 02:00270
Tue 03:00298
Tue 04:00307
Tue 05:00288
Tue 06:00262
Tue 07:00240
Tue 08:00204
Tue 09:00 · Now172
Tue 10:00 · Forecast146
Tue 11:00 · Forecast102
Tue 12:00 · Forecast83
Tue 13:00 · Forecast73
Tue 14:00 · Forecast84
Tue 15:00 · Forecast108
Tue 16:00 · Forecast119
Tue 17:00 · Forecast115
Tue 18:00 · Forecast104
Tue 19:00 · Forecast162
Tue 20:00 · Forecast186
Tue 21:00 · Forecast202
Tue 22:00 · Forecast211
Tue 23:00 · Forecast209
Wed 00:00 · Forecast203
Wed 01:00 · Forecast199
Wed 02:00 · Forecast203
Wed 03:00 · Forecast211
Wed 04:00 · Forecast223
Wed 05:00 · Forecast244
Wed 06:00 · Forecast261
Wed 07:00 · Forecast244
Wed 08:00 · Forecast197
Wed 09:00 · Forecast166
Wed 10:00 · Forecast136
Wed 11:00 · Forecast98
Wed 12:00 · Forecast82
Wed 13:00 · Forecast84
Wed 14:00 · Forecast115
Wed 15:00 · Forecast136
Wed 16:00 · Forecast140
Wed 17:00 · Forecast126
Wed 18:00 · Forecast100
Wed 19:00 · Forecast152
Wed 20:00 · Forecast174
Wed 21:00 · Forecast194
Wed 22:00 · Forecast220
Wed 23:00 · Forecast251
Thu 00:00 · Forecast279
Thu 01:00 · Forecast286
Thu 02:00 · Forecast261
Thu 03:00 · Forecast225
Thu 04:00 · Forecast192

Pollutants this hour

  • PM2.5 41.8 µg/m³ 24-hour mean 92.7 µg/m³ · 6.2× WHO’s 24-hour guideline (15) 172
  • PM10 44 µg/m³ 67
  • O₃ 124 µg/m³ 15
  • NO₂ 18 µg/m³ 8
  • SO₂ 5 µg/m³ 1
  • CO 0.48 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
Campinas São Paulo 81
Uberlândia Minas Gerais 23
Sorocaba São Paulo 84
São Paulo São Paulo 71
São José dos Campos São Paulo 52
Belo Horizonte Minas Gerais 46
Nova Iguaçu Rio de Janeiro 58

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 Ribeirão Preto’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 Ribeirão Preto right now?
172 on the US EPA scale (Unhealthy) 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 Ribeirão Preto today?
Consider shortening outdoor exercise; sensitive groups should move it indoors. The EPA’s statement for “Unhealthy”: Some members of the general public may experience health effects; members of sensitive groups may experience more serious health effects. General guidance, not medical advice.

Will the air in Ribeirão Preto get better or worse tomorrow?
Over the next 24 hours the model expects the AQI to range from 73 around 13:00 to 261 around 06:00 (4 Nov). Forecasts beyond a day are less certain.

How does Ribeirão Preto compare with other cities?
Right now it is the 27th most polluted of 849 cities we track worldwide, and 1st of 25 in Brazil, all on the same US EPA scale.

Why does another app show a different AQI for Ribeirão Preto?
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.