poor air in Santarém (PA)
AQI 100. It's the only city with poor air or worse right now.
Open-Meteo · CAMS
Air quality · now
The worst air right now is in Santarém (PA), with AQI 100 (poor). 1 city has poor air or worse. The highest UV today is in Franca (SP): 9.5.
How to read the index
The IQAr is Brazil's official air quality index. Each pollutant becomes a number, and the city's index is the worst of them.
What matters now
AQI 100. It's the only city with poor air or worse right now.
Open-Meteo · CAMS
PM2.5 at 62.3 µg/m³ (24 h average), with 2,588 fire hotspots within 150 km.
CAMS · INPE
4 of the next 5 days forecast with very poor air or worse.
Open-Meteo · CAMS
Index 9.5 today. 61 more cities at the same level. Avoid the sun from 10 am to 4 pm and wear sunscreen.
Open-Meteo · forecast
City by city
This hour's index, the pollutant driving it and the worst forecast hour for each of the next days.
| City | AQI | Status | Pollutant | PM2.5 | Next days | UV today |
|---|---|---|---|---|---|---|
| SantarémPA | 100 | Poor | PM2.5 | 62 | 282930311 | 9 |
| ManausAM | 59 | Moderate | PM2.5 | 37 | 282930311 | 9 |
| UberlândiaMG | 44 | Moderate | Ozone | 12 | 282930311 | 9 |
| Rio BrancoAC | 43 | Moderate | PM2.5 | 27 | 282930311 | 9 |
| CuiabáMT | 41 | Moderate | Ozone | 14 | 282930311 | 9 |
| São José do Rio PretoSP | 40 | Good | Ozone | 15 | 282930311 | 8 |
| Várzea GrandeMT | 38 | Good | Ozone | 11 | 282930311 | 9 |
| Ribeirão PretoSP | 37 | Good | PM2.5 | 23 | 282930311 | 9 |
| MaringáPR | 36 | Good | PM2.5 | 22 | 282930311 | 9 |
| PiracicabaSP | 35 | Good | Ozone | 14 | 282930311 | 9 |
| Juazeiro do NorteCE | 34 | Good | Ozone | 11 | 282930311 | 9 |
| PetrolinaPE | 34 | Good | Ozone | 9 | 282930311 | 8 |
Monitoring stations
Ground stations received through OpenAQ. Today they are mostly Rio de Janeiro City Hall (MonitorAr) stations and low-cost AirGradient sensors; CETESB and other state networks are not sending data to OpenAQ.
| Station | Type | Last hour (µg/m³) | Station AQI | Model for the city |
|---|---|---|---|---|
| BanguRio de Janeiro · RJ | official | 11:00 AM | 8 · Good | 22 |
| Barra da TijucaRio de Janeiro · RJ | official | PM2.5 4PM10 1110:00 PM | 7 · Good | 22 |
| CampinhoRio de Janeiro · RJ | official | PM2.5 4PM10 1410:00 PM | 9 · Good | 22 |
| Campo GrandeRio de Janeiro · RJ | official | PM10 55Ozone 3410:00 PM | 23 · Good | 22 |
| Cascadura Rio de Janeiro · RJ | official | PM2.5 5PM10 1310:00 PM | 8 · Good | 22 |
| CentroRio de Janeiro · RJ | official | PM2.5 4PM10 14Ozone 710:00 PM | 13 · Good | 22 |
| CopacabanaRio de Janeiro · RJ | official | PM10 15Ozone 1410:00 PM | 18 · Good | 22 |
| Engenheiro LealRio de Janeiro · RJ | official | 02:00 PM | 7 · Good | 22 |
| GuaratibaRio de Janeiro · RJ | official | PM2.5 7PM10 2010:00 PM | 10 · Good | 22 |
| IrajáRio de Janeiro · RJ | official | PM2.5 5PM10 18Ozone 4710:00 PM | 23 · Good | 22 |
Wildfire smoke
Smoke is made of fine particles (PM2.5) that go deep into the lungs. We match each city's PM2.5 with fire hotspots within 150 km, including neighboring countries.
Go to Wildfires →| City | PM2.5 | hotspots within 150 km | Status |
|---|---|---|---|
| SantarémPA | 62.3 | 2,588 | Poor |
UV index
The UV index measures how strongly the sun's radiation burns the skin. It's the forecast midday maximum, with the forecast clouds.
Highest UV today
Historical series · CAMS since August 2022
Days of each month in each index band, by the worst hour of the day. Data comes from the CAMS model, the same as the forecast.
The history since 2022 is being loaded gradually: 24 of 100 cities ready.
Worst hour of each day on Brazil's IQAr. CAMS is a model on a ~40 km grid: it shows the regional trend, not your street.
How it works
We show official and model data as it arrives, with the source and time on each block. This site does not issue official warnings.
Pollution: the CAMS model from the EU's Copernicus program, distributed by Open-Meteo, for the 100 largest cities. We update every 3 hours, with a 5-day forecast.
UV index: Open-Meteo's daily forecast, the midday maximum with the forecast clouds.
Smoke: INPE fire hotspots (Brazil and neighbors) within 150 km of each city.
History: the same CAMS model since August 2022, when the global series starts.
Stations: real measurements received through OpenAQ, every hour.
We follow the Brazilian Ministry of the Environment guide with the limits of CONAMA Resolution 491/2018. PM2.5 and PM10 use the 24-hour average; ozone, the 8-hour average.
Each pollutant becomes a sub-index, and the city's index is the highest of them. That's why we show which pollutant drives it: PM2.5 is often smoke or traffic; ozone, strong sun with car pollution.
Notices follow fixed rules: a city with poor air or worse now, PM2.5 above 25 µg/m³ with 50 or more fire hotspots within 150 km, 2 or more forecast days with poor air and UV of 8 or more. No text is written by artificial intelligence.
The station AQI uses the same official averages (24 h for particles, 8 h for ozone) and shows up after a day of readings. Low-cost sensors are less accurate than official stations.
CAMS is a model on a grid of about 40 km. It shows the regional situation, not a single street, and can miss very local pollution, such as near a highway or a factory.
Real stations come from OpenAQ, which today covers mainly the city of Rio de Janeiro and a few low-cost sensors.
The UV index is a forecast: with more clouds than expected, it will be lower.
On poor air days, drink water, avoid outdoor exertion and keep windows closed if there's smoke. If you feel short of breath or chest pain, seek medical care.