Worst air pollution Horta-Guinardó - Barcelona, today and tomorrow
Today (20 September): Air quality in Horta-Guinardó is moderate. AQI, PM2.5, and NO2 are moderate; PM10, O3, and PM1 are fair; SO2, CO, and HCHO are good. Pollution peaks around 10:00 PM (NO2: 43.0/100).
Tomorrow (21 September 2026): Air quality in Horta-Guinardó is moderate. PM2.5 decreases to fair; all other pollutants stay as today. Pollution peaks around 10:00 PM (NO2: 54.3/100). 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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Horta-Guinardó's dominant local factors are port and shipping emissions and construction dust. Air quality is generally worse near the port and main traffic corridors. Sea breeze usually helps clear the air by early afternoon.
Today - 20 September | Pollution peaks at 22:00
AQI:
Moderate
43.0/100
PM2.5 (fine particles):
Moderate
40.3/100
PM10 (coarse particles):
Fair
22.7/100
NO2 (nitrogen dioxide):
Moderate
43.0/100
O3 (ozone):
Fair
26.4/100
SO2 (sulfur dioxide):
Good
2.7/100
CO (carbon monoxide):
Good
0.7/100
HCHO (formaldehyde):
Good
9.9/100
PM1 (ultrafine particles):
Fair
26.0/100
Levels show the poorest local air quality during the day
Tomorrow - 21 September | Pollution peaks at 22:00
AQI:
Moderate
54.3/100
PM2.5 (fine particles):
Fair
38.5/100
PM10 (coarse particles):
Fair
21.6/100
NO2 (nitrogen dioxide):
Moderate
54.3/100
O3 (ozone):
Fair
26.2/100
SO2 (sulfur dioxide):
Good
3.4/100
CO (carbon monoxide):
Good
0.8/100
HCHO (formaldehyde):
Good
10.6/100
PM1 (ultrafine particles):
Fair
26.8/100
Other Landmarks in Barcelona
Sports venues in Barcelona
Frequently Asked Questions
Is air quality bad in Horta-Guinardó right now?
On 20 September 2026, overall air quality in Horta-Guinardó is moderate. AQI is the main air quality indicator at 43.0/100. Pollution peaks around 10:00 PM (NO2: 43.0/100).
Will air quality be worse tomorrow in Horta-Guinardó?
On 21 September 2026, air quality conditions in Horta-Guinardó will be similar to today, with AQI forecast at moderate at 54.3/100. Pollution peaks around 10:00 PM (NO2: 54.3/100).
When is air pollution at its worst in Horta-Guinardó?
What time of year has the cleanest air in Horta-Guinardó? The year's lowest air quality readings tend to cluster in winter, when high-pressure systems suppress the mixing that would otherwise clear away exhaust and smoke. Conditions generally start to recover in spring, as increasing wind and rainfall break up the stagnant air masses typical of winter. The long, hot days of summer favour ozone build-up, which can spike on the stillest, sunniest afternoons. Autumn usually sees a steady return to cleaner conditions as the ozone-favouring heat of summer fades and rainfall picks up. The mild, breezy Mediterranean climate generally supports good dispersal, though summer crowds and Saharan dust intrusions can occasionally push levels higher.
Are air quality levels in Horta-Guinardó 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: 20 September 2026 at 14:33 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.
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.
Some text on this page may be generated or summarised using artificial intelligence (AI). Wherever possible, AI-generated content is enriched with Airmine's proprietary data to improve its accuracy and relevance. However, AI-generated content may still contain errors, omissions, or inaccuracies.
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