Worst air pollution Castro, today and tomorrow
Today (9 August): Air quality in Castro is fair. AQI and PM2.5 are fair; PM10, NO2, O3, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 11:00 PM (PM2.5: 25.3/100).
Tomorrow (10 August 2026): Air quality in Castro is fair. All pollutants stay as today. Pollution peaks around 7:00 PM (PM2.5: 25.5/100). Airmine updates local air quality forecasts four times daily.
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Developed with support from the European Space Agency (ESA)’s Business Applications and Space Solutions (BASS) team
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Castro's air quality reflects the Paraná second plateau at 1,005 metres in the Campos Gerais region, with vehicle emissions from the PR-151 and surrounding dairy, soybean, and cattle agribusiness contributing local sources in this major Paraná highland farming municipality. The elevated plateau position aids background dispersal, while cold winter temperature inversions and dry season burning from surrounding agricultural land contribute seasonal PM2.5 variation.
Today - 9 August | Pollution peaks at 23:00
AQI:
Fair
25.3/100
PM2.5 (fine particles):
Fair
25.3/100
PM10 (coarse particles):
Good
11.9/100
NO2 (nitrogen dioxide):
Good
0.3/100
O3 (ozone):
Good
18.5/100
SO2 (sulfur dioxide):
Good
1.0/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.4/100
PM1 (ultrafine particles):
Good
2.9/100
Levels show the poorest local air quality during the day
Tomorrow - 10 August | Pollution peaks at 19:00
AQI:
Fair
25.5/100
PM2.5 (fine particles):
Fair
25.5/100
PM10 (coarse particles):
Good
12.0/100
NO2 (nitrogen dioxide):
Good
0.2/100
O3 (ozone):
Good
19.1/100
SO2 (sulfur dioxide):
Good
0.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
0.3/100
PM1 (ultrafine particles):
Good
2.8/100
Pollen forecast in Castro
View pollen forecastFrequently Asked Questions
Is air quality bad in Castro right now?
On 9 August 2026, overall air quality in Castro is fair. AQI is the main air quality indicator at 25.3/100. Pollution peaks around 11:00 PM (PM2.5: 25.3/100).
Will air quality be worse tomorrow in Castro?
On 10 August 2026, air quality conditions in Castro will be similar to today, with AQI forecast at fair at 25.5/100. Pollution peaks around 7:00 PM (PM2.5: 25.5/100).
When is air pollution at its worst in Castro?
Residents in Castro are most likely to notice reduced air quality when Araucaria pine and eucalyptus pollen peaks, or due to vehicle emissions from the PR-151 and surrounding dairy, soybean, and cattle agribusiness; a shift to wetter or windier weather typically brings noticeable relief.
Are air quality levels in Castro 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.
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Data provided by Airmine — Last update: 9 August 2026 at 20:27 CEST (Data is updated four times daily.)
This forecast is produced independently using Airmine's own atmospheric data and models.
Unless explicitly made clear, the content on this site has not been paid for by external organisations and is Airmine's sole responsibility.
Disclaimer: Forecasts are provided for informational purposes only and should not be relied upon as medical advice. Actual pollen and air quality conditions may vary from the forecast. If you have allergies, asthma, or another medical condition, consult a healthcare professional. Please see our Terms of Service for important information about limitations of liability.
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