Worst air pollution Sestao, today and tomorrow
Today (16 July): Air quality in Sestao is fair. AQI, NO2, and O3 are fair; PM2.5, PM10, SO2, CO, HCHO, and PM1 are good. Pollution peaks around 5:00 PM (O3: 33.2/100).
Tomorrow (17 July 2026): Air quality in Sestao is fair. NO2 decreases to good; all other pollutants stay as today. Pollution peaks around 2:00 PM (O3: 27.6/100). 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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In Sestao, local traffic and damp-weather heating smoke in winter have the largest effect on air quality. Levels stay low most of the year, with brief dips during still, foggy spells. Some towns in the region sit near heavier industry, which can affect readings on still days.
Today - 16 July | Pollution peaks at 17:00
AQI:
Fair
33.2/100
PM2.5 (fine particles):
Good
9.9/100
PM10 (coarse particles):
Good
5.7/100
NO2 (nitrogen dioxide):
Fair
26.1/100
O3 (ozone):
Fair
33.2/100
SO2 (sulfur dioxide):
Good
2.5/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
6.7/100
PM1 (ultrafine particles):
Good
7.5/100
Levels show the poorest local air quality during the day
Tomorrow - 17 July | Pollution peaks at 14:00
AQI:
Fair
27.6/100
PM2.5 (fine particles):
Good
6.3/100
PM10 (coarse particles):
Good
2.5/100
NO2 (nitrogen dioxide):
Good
15.8/100
O3 (ozone):
Fair
27.6/100
SO2 (sulfur dioxide):
Good
1.8/100
CO (carbon monoxide):
Good
0.0/100
HCHO (formaldehyde):
Good
2.8/100
PM1 (ultrafine particles):
Good
4.6/100
Pollen forecast in Sestao
View pollen forecastFrequently Asked Questions
Is air quality bad in Sestao right now?
On 16 July 2026, overall air quality in Sestao is fair. AQI is the main air quality indicator at 33.2/100. Pollution peaks around 5:00 PM (O3: 33.2/100).
Will air quality be worse tomorrow in Sestao?
On 17 July 2026, air quality conditions in Sestao will be similar to today, with AQI forecast at fair at 27.6/100. Pollution peaks around 2:00 PM (O3: 27.6/100).
When is air pollution at its worst in Sestao?
What is the yearly air quality pattern like in Sestao? Winter is generally the most challenging season, since low wind speeds and temperature inversions prevent traffic and wood-smoke pollution from dispersing. The transition into spring usually brings cleaner air, as more frequent rain and wind reduce the buildup of local pollution. Summer's combination of intense sun and high temperatures makes ozone the main concern, occasionally compounded by wildfire smoke during dry, windy spells. Autumn generally marks the shift back toward calmer, cleaner conditions as temperatures drop and rainfall becomes more regular. Frequent Atlantic weather systems mean pollution rarely has the chance to accumulate for long stretches in this area.
Are air quality levels in Sestao 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.
Want to see air quality forecasts for other cities in Spain?
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Data provided by Airmine — Last update: 16 July 2026 at 10:33 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.
For long term forecasts and maps, see the Airmine app