Ilhéus Air Quality Forecast - Today, Tomorrow
Air Quality Today
Today (10 October): Air quality in Ilhéus is moderate. AQI, PM2.5, and PM10 are moderate; NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 AM (PM2.5: 40.9/100).
Air Quality Tomorrow
Tomorrow (11 October 2026): Air quality in Ilhéus is fair. AQI improves to fair; PM2.5 decreases to fair; PM10 decreases to fair; all other pollutants stay as today. Pollution peaks around 12:00 AM (PM2.5: 30.5/100).
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Air Quality
Today - 10 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Moderate | 40.9/100 |
| PM2.5 (fine particles) | Moderate | 40.9/100 |
| PM10 (coarse particles) | Moderate | 40.9/100 |
| NO2 (nitrogen dioxide) | Good | 0.1/100 |
| O3 (ozone) | Good | 8.5/100 |
| SO2 (sulfur dioxide) | Good | 0.3/100 |
| CO (carbon monoxide) | Good | 0.2/100 |
| HCHO (formaldehyde) | Good | 0.5/100 |
| PM1 (ultrafine particles) | Good | 8.1/100 |
Tomorrow - 11 October
| Pollutant | Level | Value |
|---|---|---|
| AQI | Fair | 30.5/100 |
| PM2.5 (fine particles) | Fair | 30.5/100 |
| PM10 (coarse particles) | Fair | 28.5/100 |
| NO2 (nitrogen dioxide) | Good | 0.1/100 |
| O3 (ozone) | Good | 7.9/100 |
| SO2 (sulfur dioxide) | Good | 0.3/100 |
| CO (carbon monoxide) | Good | 0.2/100 |
| HCHO (formaldehyde) | Good | 0.6/100 |
| PM1 (ultrafine particles) | Good | 5.9/100 |
Local Environmental Conditions
Around the heart of Ilhéus, dense development means road traffic is the main local source of nitrogen dioxide and fine particles. Sea breezes along the coast usually help ventilate the area. Port and shipping activity adds to local emissions. Trees nearby help filter some particles from the air, though in hot weather they also emit compounds that feed ozone formation.
The dry season, roughly June to September, brings the haziest air, as dust and smoke build up without rain to clear them. The wettest months, November to January, usually bring the cleanest air. With temperatures around 26°C all year, sunny afternoons can raise ozone levels in any month, especially near busy roads.
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Frequently Asked Questions About Air Quality in Bahia
Is air quality bad in Ilhéus right now?
On 10 October 2026, overall air quality in Ilhéus is moderate. AQI is the main air quality indicator at 40.9/100. Pollution peaks around 11:00 AM (PM2.5: 40.9/100).
Will air quality be worse tomorrow in Ilhéus?
On 11 October 2026, air quality conditions in Ilhéus will be better than today, with AQI forecast at fair at 30.5/100. Pollution peaks around 12:00 AM (PM2.5: 30.5/100).
When is air pollution at its worst in Ilhéus?
The dry season, roughly June to September, brings the haziest air, as dust and smoke build up without rain to clear them. The wettest months, November to January, usually bring the cleanest air. With temperatures around 26°C all year, sunny afternoons can raise ozone levels in any month, especially near busy roads.
Are air quality levels in Ilhéus based on measurements or forecasts?
It is forecasts derived by downscaling forecasts provided by EU’s Copernicus Atmosphere Monitoring Service (CAMS) by taking into account local conditions such as traffic patterns. CAMS bases its forecast on satellite measurements of particles and chemical compounds in the atmosphere. Airmine’s services were developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team.
Why doesn’t the forecast always reflect wildfire impacts?
Airmine’s forecast uses CAMS (Copernicus Atmosphere Monitoring Service) as its background atmospheric model. While CAMS includes wildfire emissions, these are derived from satellite observations and are not available in real time. During rapidly evolving wildfire events, there may therefore be a delay before increased emissions are incorporated into the model. As a result, the forecast may temporarily underestimate PM₂.₅ and other pollutants associated with wildfire smoke.
During rapidly evolving wildfire events, CAMS may lag by approximately 1–2 days before increased wildfire emissions are fully represented, which can lead to temporary underestimation of PM₂.₅ concentrations in Airmine’s forecast.
Understanding the Scale
The 0–100 air quality scores represent risk levels, not direct air pollutant concentrations. Higher scores indicate higher risk.
Air Quality
| Good | 0-20 | Low air quality risk. Air quality is expected to be good, with low levels of pollution. |
| Fair | 20-40 | Generally low air quality risk. Air quality is expected to be acceptable, with some pollution present. |
| Moderate | 40-60 | Moderate air quality risk. Air pollution is elevated and air quality may be less favorable. |
| Poor | 60-80 | High air quality risk. Air pollution is high and air quality is expected to be poor. |
| Very Poor | 80-100 | Very high air quality risk. Air pollution is very high and air quality is expected to be very poor. |