Air quality
Air quality in Ribeirão Preto today
Updated
Unhealthy for Sensitive Groups (US AQI 104) People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. Model estimate for Sun, Oct 25, 10:00 pm (01:00 UTC).
Live AQI, PM2.5, PM10 and ozone for Ribeirão Preto, São Paulo, Brazil, with a 48-hour forecast and the best time to be outside.
- US AQI now
- 104 Unhealthy for Sensitive Groups
- PM2.5
- 38 µg/m³ 2.5× WHO 24-h guideline
- PM10
- 38 µg/m³
- Ozone
- 40 µg/m³
- Dominant pollutant
- PM2.5 sub-index 104
- Best hour tomorrow
- 9:00 pm AQI 80
- European AQI
- 53
Air quality in Ribeirão Preto right now
Right now the modelled US Air Quality Index for Ribeirão Preto, São Paulo, Brazil is 104, which falls in the "Unhealthy for Sensitive Groups" band (up to 150). People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors.
The index is driven mainly by PM2.5, whose own sub-index is 104. Fine and coarse particles come from traffic, heating, industry, dust and smoke; they build up on calm nights and clear when wind or rain arrives.
PM2.5 is 38 µg/m³, 2.5 times the WHO 24-hour guideline of 15 µg/m³; PM10 is 38 µg/m³ against a guideline of 45; ozone is 40 µg/m³ (below the WHO 8-hour level of 100); nitrogen dioxide is 28 µg/m³ (above the 24-hour guideline of 25).
Also this hour: carbon monoxide 557 µg/m³.
Ribeirão Preto AQI forecast: next 48 hours
Over the next 24 hours the AQI is forecast to range from 79 around Mon 10:00 pm to 104 around Sun 10:00 pm, from "Moderate" at best to "Unhealthy for Sensitive Groups" at worst.
The following day is expected to be cleaner, averaging about 69 against 90 for the next 24 hours.
| Local time (America/Sao_Paulo) | US AQI | Category | PM2.5 µg/m³ | PM10 µg/m³ | Ozone µg/m³ |
|---|---|---|---|---|---|
| Sun 10:00 pm | 104 | Unhealthy for Sensitive Groups | 37.8 | 38 | 40 |
| Mon 1:00 am | 99 | Moderate | 39.3 | 40 | 31 |
| Mon 4:00 am | 95 | Moderate | 37.1 | 38 | 26 |
| Mon 7:00 am | 90 | Moderate | 31.1 | 32 | 40 |
| Mon 10:00 am | 88 | Moderate | 16.2 | 17 | 94 |
| Mon 1:00 pm | 85 | Moderate | 13.5 | 14 | 130 |
| Mon 4:00 pm | 84 | Moderate | 10 | 10 | 111 |
| Mon 7:00 pm | 82 | Moderate | 19.6 | 21 | 74 |
| Mon 10:00 pm | 79 | Moderate | 19.3 | 21 | 56 |
| Tue 1:00 am | 74 | Moderate | 19.8 | 21 | 32 |
| Tue 4:00 am | 70 | Moderate | 21.9 | 23 | 20 |
| Tue 7:00 am | 67 | Moderate | 23 | 24 | 31 |
| Tue 10:00 am | 66 | Moderate | 14.8 | 17 | 80 |
| Tue 1:00 pm | 66 | Moderate | 13.8 | 15 | 118 |
| Tue 4:00 pm | 66 | Moderate | 15.3 | 16 | 96 |
| Tue 7:00 pm | 69 | Moderate | 32.5 | 34 | 56 |
| Tue 10:00 pm | 72 | Moderate | 35.7 | 38 | 52 |
Every third hour of the CAMS forecast via Open-Meteo. US AQI uses rolling averages (24 h for particles, 8 h for ozone), so it moves more slowly than the hourly concentrations.
Best time to be outside in Ribeirão Preto tomorrow
Between 6 am and 9 pm local time, the cleanest air tomorrow is forecast around 9:00 pm (AQI 80, Moderate) and the worst around 6:00 am (AQI 92). That is a swing of 12 points, so a run or walk around 9:00 pm is noticeably better.
Ribeirão Preto vs the rest of Brazil
Across 144 Brazil cities we track, the average US AQI right now is 50 (Good). Ribeirão Preto at 104 is 54 points worse than average.
It ranks 143 of 144 from cleanest to most polluted; the cleanest is Caxias do Sul (24) and the most polluted Manaus (137).
For context, the median across 3,556 cities worldwide is 58.
Air quality in cities near Ribeirão Preto
| City | Distance | US AQI | Category | PM2.5 µg/m³ |
|---|---|---|---|---|
| Franca | 83 km | 61 | Moderate | 16.6 |
| Rio Claro | 140 km | 61 | Moderate | 11.9 |
| Uberaba | 159 km | 47 | Good | 10.8 |
| Limeira | 160 km | 61 | Moderate | 11.9 |
| São José do Rio Preto | 168 km | 56 | Moderate | 10.6 |
| Piracicaba | 173 km | 64 | Moderate | 12.1 |
| Bauru | 181 km | 42 | Good | 5.4 |
| Campinas | 207 km | 61 | Moderate | 8.4 |
Model vs measured
We found no measured PM2.5 sensor cell within 25 km of Ribeirão Preto, so the numbers on this page are model estimates. Models capture regional pollution well but can miss very local sources such as a busy road or a nearby fire.
Wildfire smoke
PM2.5 is forecast to reach 39 µg/m³ in the next 24 hours while NASA satellites detected 2 fire hotspots within 300 km in the last day (nearest about 275 km away). Smoke is a likely contributor: keep windows closed, run an air purifier or HVAC filter, and check the fire map before heading out.
Advice for sensitive groups
At 104, children, older adults, pregnant people and anyone with asthma, COPD or heart disease should limit time outdoors, especially strenuous activity. A well-fitted N95/FFP2 mask cuts particle exposure; it does not filter ozone.
What the US AQI numbers mean
| US AQI | Category | What it means |
|---|---|---|
| 0-50 | Good | Air quality is satisfactory and poses little or no risk; a good time for outdoor activity. |
| 51-100 | Moderate | Acceptable for most people. Unusually sensitive people should consider shortening long or heavy exertion outdoors. |
| 101-150 | Unhealthy for Sensitive Groups | People with heart or lung disease, older adults, children and teens should cut back on prolonged or heavy exertion outdoors. |
| 151-200 | Unhealthy | Everyone should reduce prolonged or heavy exertion outdoors; sensitive groups should avoid it and keep windows closed. |
| 201-300 | Very Unhealthy | Health alert: everyone should avoid prolonged or heavy exertion outdoors, and sensitive groups should stay indoors. |
| 301-500 | Hazardous | Emergency conditions: everyone should avoid all outdoor physical activity and stay indoors with filtered air if possible. The scale tops out at 500; heavier dust or smoke is shown as 500. |
Values on this page are modelled by CAMS (Copernicus) and served by Open-Meteo; they are estimates for the area around the city centre, not readings from an official monitor.
Nearby cities
More for Ribeirão Preto
Air quality elsewhere
Data: Open-Meteo Air Quality API, Copernicus Atmosphere Monitoring Service (CAMS), NASA FIRMS.